John Mulaney was 25 in John Mulaney: The Top Part when he played the character 'Himself'.
That was over 15 years ago in 2009.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 41, and has starred in 21 movies in total, 19 of those since John Mulaney: The Top Part was released.
In John Mulaney: The Top Part, I think John Mulaney looks: