Miranda Cosgrove was 9 in School of Rock when she played the character 'Summer Hathaway'.
That was over 21 years ago in 2003.
This was her first recorded movie acting credit (although may not technically be her first actual acting role).
Today she is 30, and has starred in 32 movies in total, 32 of those since School of Rock was released.
In School of Rock, I think Miranda Cosgrove looks: