How old was Jayne Mansfield when she died?

I only recently learned that Mariska Hargitay from Law and Order SVU was her daughter and was in the backseat with her little brother when the car crashed

Seatbelts, if existent at the time, were an option that you installed yourself.

ChewyGazelle68623, I don't think anyone really did in those days. James Dean wasn't wearing one either

Player #3059660, were they wearing seat belts?? That's an important thing to do, especially head-on crashes!!!

so sad