There is no set answer.... At least not that I'm aware of.
But if it helps, I turned 30 this year and me and wifey got 22k saved up. A nice chunk of that came from a car accident I was in this year. but prior to that we had at least 9k saved and before we got engaged and moved in together I probably had 5k saved on my own.
It really just depends on what you trying to do. The thing with me is I don't spend alot of money. I have most of the basic stuff I want so I'm bascially just stacking money now so that if we want to go on vacay or buy something new we can do it without it "hurting" us