The Universe appears to be quite old but for some reason the really interesting things happened at either end of the arrow of time. Being a fan of This Is Indexed I though I would try one myself - nope not funny.
Everything interesting happens at the ends of time.
4,600,000,000 Solar system
530,000,000 The Cambrian explosion
2,500,000 Stone Age (begins)
15,000 Domestication of dog, cow, pig, etc.
10,000 Argicultural revelotion
5,300 Bronze Age (begins)
230 Industrial Revolution (begins)