Domhnall Gleeson was 26 in Harry Potter and the Deathly Hallows: Part 1 when he played the character 'Bill Weasley'.
That was over 14 years ago in 2010.
Today he is 41, and has starred in 38 movies in total, 29 of those since Harry Potter and the Deathly Hallows: Part 1 was released.
In Harry Potter and the Deathly Hallows: Part 1, I think Domhnall Gleeson looks: