Maggie Smith was 75 in Harry Potter and the Deathly Hallows: Part 2 when she played the character 'Minerva McGonagall'.
That was over 13 years ago in 2011.
Today she is 89, and has starred in 90 movies in total, 22 of those since Harry Potter and the Deathly Hallows: Part 2 was released.
In Harry Potter and the Deathly Hallows: Part 2, I think Maggie Smith looks: