Last I knew, the universe is 13.7 billion years old give or take a couple hundred million years, and is like 150 billion light years across (yeah I don't know how that works either but that's what I heard, there are literally places too far away to ever reach even at the speed of light since it is moving away from us).

Earth is 4.3 billion years old I heard, but maybe it is 4.5 not sure. The sun is about 5 billion years old and half way through its life. As it ages it has been and will get hotter, in a couple hundred million years life will no longer be possible. And if we survive that we have to worry about the merger with the Andromeda Galaxy. Of course gamma ray bursts, ice ages, comet or asteroid strikes, stars or a black hole passing through our solar system could all finish us of in a few thousand or hundred thousand years or tommorrow, the chance is better than winning the lotto or being struck by lightning. So enjoy life and worry about today because there may not be a tommorrow. peace