When the 10th Doctor meets up with the Master in the timeline that never happened he gets aged many many years with the Master's "Laser" Screwdriver.
How did he do that?
Do lasers affect timelords in some weird way?
Science Fiction & Fantasy Stack Exchange is a question and answer site for science fiction and fantasy enthusiasts. It only takes a minute to sign up.Sign up to join this community
The Master explained this in the episode. He built the technology from the Lazarus Project into his screwdriver, including bidirectionality, so he could age someone as well as de-age them.
Now, for the bigger question, how he fit all that in a handheld-sized package, ... well, "it's bigger on the inside!" is about the only explanation we could guess at.