Planet Earth

Do we know the age difference between Planet earth and some of the recently discovered planets?
I heard about planets outside of our solar system which are similar to Earth and could(in possibility) contain life.
What is the age difference(if we know) between Earth and said planets (from formation into a planet).
Or is it just completely unknown?
I know stuff about it…
its called something like G4 i think, its like 4 x the size of earth and it has a dwarf sun that its close to. it has like 2 or 3 small moons, and its temp is less extreme then earths like – 60- 75 degrees. and one year there is equal to 13 days on earth. and most of it it water like earth – 70-80%. AND OXYGEN RICH – even better/cleaner than earth.
and like 4 -5 other small planets around it
oh oh, and extra detail – if we were to live on it – the sky would be a red – orange- pink color..because the dwarf star is red, and we are close to it (but the closeness isnt a bad thing)
ok G4 wasnt the name – i found some other article online about it
The Secret – Planet Earth