Anton Yelchin was 19 in Terminator Salvation when he played the character 'Kyle Reese'.
That was over 15 years ago in 2009.
In 2016 he died aged just 27, starring in 52 films in his career, 34 of those after Terminator Salvation was first released. If he were alive today he would be 35.
In Terminator Salvation, I think Anton Yelchin looks: