Anyone start their career late in Life?

I am 39 yoa; male; BS Finance and I still don't know what I want to be when I grow up

Get this:

Dropped out of high school at 17. Never graduated high school.
Had first child at 20.
Started college at 24.
Got my first degree (AA) at 26.
Joined the Air Guard/Reserves at 27.
Got my second degree (BS) at 28.
Had second child at 30.
Had third child at 32.
Got third degree (MA) at 35.
Got deployed at 36.
Had my fourth child at 39.
Took temporary hiatus from military at 42.
Got my fourth degree (BSN) at 49.
Started working in ER from hell 20 days before my fiftieth birthday.

Am planning on applying to medical school next year.

Call me crazy, but does anyone know when life is going to stop?
What happens if they discover HOW to stop aging?

Am just trying to be prepared.......late in life to me is 105. You only go around once.

Just do it.