Milo Manheim was 15 in Disney Parks Presents a Disney Channel Holiday Celebration when he played the character 'Himself'.
That was over 6 years ago in 2017.
This was his first recorded movie acting credit (although may not technically be his first actual acting role).
Today he is 23, and has starred in 11 movies in total, 9 of those since Disney Parks Presents a Disney Channel Holiday Celebration was released.
In Disney Parks Presents a Disney Channel Holiday Celebration, I think Milo Manheim looks: