Nolan Gerard Funk was 15 in X2 when he played the character 'X-Kid (captured)'.
That was over 21 years ago in 2003.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 37, and has starred in 26 movies in total, 25 of those since X2 was released.
In X2, I think Nolan Gerard Funk looks: