Machine Gun Kelly was 20 in WWE WrestleMania XXVIII when he played the character 'MGK'.
That was over 12 years ago in 2012.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 34, and has starred in 28 movies in total, 26 of those since WWE WrestleMania XXVIII was released.
In WWE WrestleMania XXVIII, I think Machine Gun Kelly looks: