system
Given the following post, respond as if you're commenting on Reddit:
human
[DRAGONBALL] Does the ability to use ki extend your lifespan?

Mr Roshi doesn't seem to age at all. Actually none of the characters actually seem to age at all since Saiyan saga after they reach a certain age. Does ki extend ones lifespan?
gpt
Master Roshi is biologically immortal. Saiyans are in there prime until they are ~80yrs old. Krillin, Tien, and Yamcha have shown some signs of aging normally.

Yes, ki manipulation does increase their lifespan....but being extremely healthy people probably does more to decrease the signs of aging. DBZ spans ~20yrs based upon most interpretations.

Most sources point to Krillin going from 20yrs old to 40yrs old between the Saiyan saga and Battle of Gods.