Brandon T. Jackson was 24 in Percy Jackson & the Olympians: The Lightning Thief when he played the character 'Grover Underwood'.
That was over 13 years ago in 2010.
Today he is 39, and has starred in 23 movies in total, 11 of those since Percy Jackson & the Olympians: The Lightning Thief was released.
In Percy Jackson & the Olympians: The Lightning Thief, I think Brandon T. Jackson looks: