Kim Rossi Stuart was 15 in The Name of the Rose when he played the character 'Novitiate'.
That was over 38 years ago in 1986.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 54, and has starred in 39 movies in total, 38 of those since The Name of the Rose was released.
In The Name of the Rose, I think Kim Rossi Stuart looks: