Gene Kelly was 38 in Singin' in the Rain when he played the character 'Don Lockwood'.
That was over 72 years ago in 1952.
In 1996 he died aged 83, starring in 80 films in his career, 57 of those after Singin' in the Rain was first released. If he were alive today he would be 111.
In Singin' in the Rain, I think Gene Kelly looks: