Kodi Smit-McPhee was 8 in Stranded when he played the character 'Teddy'.
That was over 18 years ago in 2006.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 27, and has starred in 31 movies in total, 30 of those since Stranded was released.
In Stranded, I think Kodi Smit-McPhee looks: