James Doohan was 70 in Star Trek VI: The Undiscovered Country when he played the character 'Montgomery Scott'.
That was over 32 years ago in 1991.
In 2005 he died aged 85, starring in 32 films in his career, 14 of those after Star Trek VI: The Undiscovered Country was first released. If he were alive today he would be 104.
In Star Trek VI: The Undiscovered Country, I think James Doohan looks: