Jan-Michael Vincent was 52 in Buffalo '66 when he played the character 'Sonny'.
That was over 26 years ago in 1998.
In 2019 he died aged 74, starring in 68 films in his career, 3 of those after Buffalo '66 was first released. If he were alive today he would be 79.
In Buffalo '66, I think Jan-Michael Vincent looks: