Age of the Earth
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The consensus view of scientists in relevant fields is that the Age of the Earth and the solar system is roughly 4.54 billion (4.54 × 109 ± 1%) years , an age primarily derived by radiometric dating. Because of the molten state of the early Earth, erosion, and subduction of tectonic plates moving surface material into the Earth's mantle, radiometric dating of materials originating on Earth provides a range of lower limits for the age of the Earth of approximately 3.8 to 4.2 billion years.
The best estimates of the age of the Earth are calculated from the ratios of lead and uranium in meteorites found on Earth. These estimates are verified by helioseismic dating.
 Formation of the solar system
The original formation of the Earth was a violent process that resulted in an early Earth that was in effect, constantly molten. Therefore, we do not and perhaps can not know exactly how old the Earth is. However, science has determined that our Solar System was formed roughly 4.54 billion years ago. This age is based on radiometric evidence from meteorites found on Earth. Lunar rock, which is collected from a body that does not have a fluid mantle or crust and so has therefore remained constant, dates to 3.8 - 4.2 billion years. Other evidence includes a meteorites that have landed on Earth, which date to a slightly older 4.5 - 4.6 billion years. Though not yet perfected, recently developed technology to study the sun, helioseismolgy, provides excellent independent verification of the age of the solar system 
Use of meteorites to date the Earth relies on assumptions required by various hypotheses of the formation of the Earth and other planets from the accretion disk created by the Jeans collapse of the material that formed our sun. On its own, analysis of any particular meteorite may depend on the assumption of uniform rates of decay of radioactive isotopes, which creationists attack as unsound based on the necessary consequence of their dogmatic view that the Bible must trump science, and the uniform distribution of lead isotopes in the solar system. Taken together, analysis of various meteorites correlates ages of the early solar system, and therefore the Earth, to a high degree of statistical significance.
A common creationist criticism of radiometric dating is that it provides inaccurate results. The claim is frequently due to attempts to analyze contaminated specimens or the use of methods inappropriate to the analysis of specific materials. The claim may also be due to a misunderstanding and inaccurate interpretation of scientific literature on the subject. When used properly, radiometric dating provides results that are known to be accurate from their close correspondence with other methods of dating the Earth and solar system.
 Formation of the Earth
Due to the nature of our own Earth, and the fact that the mantle is fluid and the crust has in fact undergone many stages in its formation, it is nearly impossible to find rocks that were actually created when the Earth was formed. However, recently a few samples of lead, believed to be formed during the Archaean, have been dated to 4.40 billion years, fitting perfectly into a theory of formation at the same time as the rest of the Solar System, at 4.5 billion years.
 Other (religious) views
Simply because the concept of deep time is quite hard to wrap your head around, few cultures that existed prior to modern scientific scholarship have specifically posited an age of the Earth that expanded much beyond the longest time they could imagine – generally, thousands or perhaps tens of thousands of years.
 Early Christian and modern Young Earth Creationist Views
There has always been a strand of Christianity that held idea that the Earth is only thousands of years old.
The two Genesis creation stories and the supposedly detailed listing of generations (also known as the "begats") reinforce the idea that the Earth must have been created within the last 10,000 years or so. Similarly, Talmudic commentaries over the last 2000 years place Creation at roughly 7,000 years, give or take many thousands of years.
In the 17th century era of a new "rational" approach to the world, Christians, both theologians and scientists, attempted to define the Day of Creation more precisely. Isaac Newton, using the Bible as a template, worked out the year of creation of the Earth to be 4000 BC, Johannes Kepler, 3992 BC, and Bede at 3952.
The most famous date for the Day of Creation is the one proposed by James Ussher who determined that he could figure out the date of creation by compiling a chronology of all the events in the Bible, together with Persian & Chaldean histories for the inter-testamental period. Working back from a presumed date of Jesus' birth of 0 AD/BC Ussher arrived at a date of Creation of exactly Sunday, October 23, 4000 BC. Learning that there was a miscalculation in the Gregorian calendar, and that Christ's birth is roughly 3 years off, he amended his date to Sunday, October 23, 4004 BC.
It is not at all surprising that all these dates spin near or around the 4000 BCE mark, as they are based on a popular Christian idea around the 17th Century that the Earth only had a 6000 year life span. .
Though most of modern Christianity has now set aside the clearly unscientific notion of "a few thousand years," there persists a group of Christians called "Young Earth Creationists" who set the date of Creation as some time within the last 10,000 years. They originally followed Ussher's dates; however, indisputable archaeological evidence of civilizations older than 6,000 years, generally pushes "YEC" types to say "up to 10,000 years."
a) How old is the Universe? _______________________
"the angels and the spirit ascend unto Him in a day, the measure of which was fifty thousand years." (Quran 70:4)
This verse refers to the ascent of angels and the spirit (meant to be Gabriel) back to heaven after settling all matters of life in the universe.
The verse clearly said a day that "was" and not a day that 'is', which clearly indicates that that day was in the past (50,000 years ago).
"…a day relative to your God is equivalent to a thousand years of your count." (Quran 22:47)
With a few simple equations:
If 1 day (for God) = 1000 years (for man)
1 year (for God) = 1000 x 365 (for man)
= 365,000 years
50,000 years (for God) = 365,000 x 50,000 (for man)
= 18.25 billion years
The 50,000 years mentioned is God's years and not men's. This is because man was not mentioned at all in that verse, and more importantly because the subject of the verse (creation of the universe) is obviously a matter executed by God and not by man and, so, its description must also be as related to God and not to man.
This becomes evident when we compare this verse to other verses that clearly speak of years as related to man's count, like the verse:
"…on a day, the measure of which was a thousand years of your count." (Quran 32:5)
(b) How old is Earth? ________________
Muslims believe that 6 days passed at God's Throne but we experienced 18.25 billion years (according to Quran) on Earth: Muslims believe that God is not bound to His Throne; rather He created it and set it as a reference.
"We [Allah] created the heavens and the Earth and all what's between them in six days, and We were not touched by fatigue." (Quran 50.38)
"Say: "Is it that you deny Him [Allah] who created the Earth in two days? And you claim others to be equal to Him? He is the Lord of (all) the Worlds." (Quran 41.9)
When God says that He created the Heavens, the Earth and EVERYTHING IN BETWEEN in six days this means that He is referring to the period of existence. Earth has been in existence for 2 days (out of 6). In God's Throne time, Earth is 2 days old while the Heavens and Earth and everything in between are 6 days old.
This makes the age of Earth to be one third the age of the universe (2/6 = 1/3). The age of the universe is 18.25 billion years and the Earth is 1/3 of that.
So, the Earth is 6.1 billion years according to numerical values in Qur'an
The Zoroastrian religion is one of the few religions that provides a specific age in which the universe and the Earth was made. The life of the Universe is 4 units of 3,000 years each, for a total of 12,000 years. The universe as we know it ("all of Creation" is the term, so we will assume the Earth is part of Creation) was made after 3000 years of perfect balance. Thus making the age of the Earth somewhere between 6000-9000 years, depending on when it fell in the Age of Creation.
On the other hand, according to Hinduism the Earth is much older. Hinduism states that the Earth came into being with the god Brahma and after doing some calculations with units of time found in Hinduism we come up with an age of 155.5 trillion years.
Dick Teresi in his book "Lost Discoveries: The Ancient Roots of Modern Science", reviews Vedas, and writes that "Twenty-four centuries before Isaac Newton, the Hindu Rig-Veda asserted that gravitation held the universe together. The Sanskrit speaking Aryans subscribed to the idea of a spherical earth in an era when the Greeks believed in a flat one. The Indians of the fifth century A.D. calculated the age of the earth as 4.3 billion years; scientists in 19th century England were convinced it was 100 million years."
Huston Smith remarks these theories as:-
Science researchers, such as Carl Sagan and Fritjof Capra have stated similarities between the latest scientific information of the age of the universe, and the Hindu concept of a "day and night of Brahma", which is much familiar to the current known age of the universe than other creation views. Sagan describes as:-
“”The Hindu religion is the only one of the world's great faiths dedicated to the idea that the Cosmos itself undergoes an immense, indeed an infinite, number of deaths and rebirths. It is the only religion in which time scales correspond to those of modern scientific cosmology. Its cycles run from our ordinary day and night to a day and night of Brahma, 8.64 billion years long, longer than the age of the Earth or the Sun and about half the time since the Big Bang.
 See also
- 101 evidences for a young age of the Earth and the universe
- Evidence against a recent creation
- Old Earth creationism
- ↑ http://pubs.usgs.gov/gip/geotime/age.html
- ↑ http://sp.lyellcollection.org/content/190/1/205
- ↑ Helioseismology, or the study of acoustic waves and their propagation in the sun, gives a more general date of 4.0 - 5.5 billion years. While not as precise as those provided by radiometric dating, these dates provide independent confirmation that radiometric dating is not providing wildly inaccurate dates.
- ↑ See, Radiometric dating.
- ↑ Zircons found in the Jack Hills area of Australia have returned an age of 4.4 billion, interpreted through crystallization. These same samples seem also to suggest that there was water on the Earth as early as 4.4 billion years ago. ref: wikipedia 
- ↑ Meaning, if you follow, we were all supposed to be dead just over 10 years ago
- ↑ The "Era of Zoroaster", S. H. Taqizadeh, The Journal of the Royal Asiatic Society of Great Britain and Ireland, No. 1 (Apr., 1947), pp. 33-40.
- ↑ Bhakti Yoga Meditation - Hinduism: Age of the Earth according to Vedic chronology
- ↑ http://www.webmastersitesi.com/134765.2
- ↑ "Great Minds on India" by Salil Gewali
- ↑ Sagan, Carl (1985). Cosmos. Ballantine Books. ISBN 978-0-345-33135-9. p. 258.
- ↑ Capra, Fritjof (1991). Tao of Physics. Shambhala. ISBN 978-0-87773-594-6. p. 198
- ↑ Sagan, Carl (1985). Cosmos. Ballantine Books. ISBN 978-0-345-33135-9. p. 258.