It's all how you spend or save. I personally know people that have shit jobs who have just never spent any money that just have a huge wad sitting in the bank waiting for nothing.
Prime example- I know a sandblaster who's checking account reciept I happened to see when I was detailling his car as a kid and he had over $300k in just that one account and this was after he just bought a brand new Caddy and paid cash, it just blew my mind that someone who appeared to have so little had so much.
So you never know. A dentist with good money habits could easily have a VERY nice nest egg.