Corey Feldman was 17 in Teenage Mutant Ninja Turtles when he played the character 'Donatello (Voice)'.
That was over 34 years ago in 1990.
Today he is 52, and has starred in 103 movies in total, 80 of those since Teenage Mutant Ninja Turtles was released.
In Teenage Mutant Ninja Turtles, I think Corey Feldman looks: