Adolescence

Adolescence was a difficult time for Grant, who observed that it went on for a lot longer. (TV: The Return of Doctor Mysterio)

The Doctor

The Tenth Doctor called the First Doctor a teenager, to which he objected. (AUDIO: Collision Course)

The Fourth Doctor recalled having been a "spotty teenager" for fifty years, (COMIC: Doctor Who and the Time Witch) while the Thirteenth Doctor remembered hot-wiring warp drives on the weekends when she was a teenager. The Thirteenth Doctor quickly noted, however, that there had been no weekends on Gallifrey, nor indeed teenagers. (TV: Ascension of the Cybermen)