Roy Scheider was 51 in 2010 when he played the character 'Dr. Heywood Floyd'.
That was over 39 years ago in 1984.
In 2008 he died aged 75, starring in 83 films in his career, 56 of those after 2010 was first released. If he were alive today he would be 91.
In 2010, I think Roy Scheider looks: