Robin Williams was 56 in Night at the Museum: Battle of the Smithsonian when he played the character 'Theodore Roosevelt'.
That was over 15 years ago in 2009.
In 2014 he died aged 63, starring in 158 films in his career, 36 of those after Night at the Museum: Battle of the Smithsonian was first released. If he were alive today he would be 72.
In Night at the Museum: Battle of the Smithsonian, I think Robin Williams looks: