No one can tell you exactly of course. But modern geologists and geophysicists consider the age of the Earth to be around 4.54 billion years old. This age has been determined by radiometric age dating of meteorite material and is consistent with the ages of the oldest-known terrestrial and lunar samples.
No, the Earth is not in an ice age right now. The last ice age ended about 10,000 years ago.
Geologically speaking, pretty much the exact same age as it is now (~4.6 billion years)
Apollo, as with all Greek gods, is immortal, so he wouldn't have an exact age.
There are no exact amount if mountains on Earth. Some are even forming now, so you wouldn't now how much mountains there are on Earth.
His exact year of birth is unknown. Historians estimate that he was born in the 1580s, so in the Year 2000, he would be 420.
Somewhere north of six billion humans on the Earth right now. Some web sites claim precise figures, but anything more exact than this is mostly guesswork.
Earth.
13,662,885 right now and increasing daily !
About 1500 right now, if I recall correctly.
depends on where you are
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