Stan Lee was 90 in Captain America: The Winter Soldier when he played the character 'Smithsonian Guard'.
That was over 10 years ago in 2014.
In 2018 he died aged 95, starring in 123 films in his career, 46 of those after Captain America: The Winter Soldier was first released. If he were alive today he would be 101.
In Captain America: The Winter Soldier, I think Stan Lee looks: