Darlene Vogel was 26 in Back to the Future Part II when she played the character 'Spike'.
That was over 35 years ago in 1989.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 61, and has starred in 15 movies in total, 15 of those since Back to the Future Part II was released.
In Back to the Future Part II, I think Darlene Vogel looks: