Jean-Paul Belmondo was 23 in Sunday Buddies when he played the character 'Trébois'.
That was over 67 years ago in 1957.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
In 2021 he died aged 88, starring in 99 films in his career, 98 of those after Sunday Buddies was first released. If he were alive today he would be 91.
In Sunday Buddies, I think Jean-Paul Belmondo looks: