Colin Kaepernick was 25 when he made his NFL playoff debut, rushing for 181 yards and throwing for 263 more in a 45-31 playoff rout of the Packers en route to a 49ers Super Bowl appearance.
He was 26 the next season when he took the 49ers back to the NFC title game in his first full season as a starter.
Kaepernick was 28 when he took a knee during the national anthem for the first time in protest of police brutality during the 2016 season.
He had turned 29 later that season by the time he took his most recent snap in the NFL — playing for, by then, a dreadful 49ers team but still managing to throw 16 touchdowns with just four interceptions.