C. Thomas Howell was 14 in E.T. the Extra-Terrestrial when he played the character 'Tyler'.
That was over 42 years ago in 1982.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 57, and has starred in 151 movies in total, 148 of those since E.T. the Extra-Terrestrial was released.
In E.T. the Extra-Terrestrial, I think C. Thomas Howell looks: