Why don't Saiyans age?


I have seen many _Dragon Ball_ series like _Dragon Ball_ , _Dragon Ball Z_ ,
_Dragon Ball GT_. One thing remains same is that Saiyans never look aged. The
last episode of _Dragon Ball GT_ shows **Pan** as a grandma, but **Goku** was
looking as young as he was in _Dragon Ball Z_. Why don't Saiyans age?




To my knowledge, they do age, just very slowly in adulthood. This is a genetic
trait, I assume, to reach longer duration of physical demands. They are
designed to be fighters, and longevity of a lifespan is only practical. Vegeta
confirmed this towards the end of DBZ: "So they can fight longer".

From a quick Google search:

> According to the Daizenshuu, Saiyan's lifespan is about the same as an
> average Human (70 to 90 years, with exceptions, of course), but keep in
> their peak longer. Unlike Humans, Saiyans remain in their youth and prime
> much longer. As explained by Vegeta near the end of Dragon Ball Z, they stay
> young longer because they live for and are built for battle

From [Saiyan](http://dragonball.wikia.com/wiki/Saiyan) article on Dragon Ball
wiki. (Visit the link for more examples, and a more definitive explanation).

Something else to consider: they stay in their prime longer because they are
full Saiyans, whereas Pan is only quarter Saiyan.




To my knowledge, they do age, just very slowly in adulthood. This is a genetic
trait, I assume, to reach longer duration of physical demands. They are
designed to be fighters, and longevity of a lifespan is only practical. Vegeta
confirmed this towards the end of DBZ: "So they can fight longer".

From a quick Google search:

> According to the Daizenshuu, Saiyan's lifespan is about the same as an
> average Human (70 to 90 years, with exceptions, of course), but keep in
> their peak longer. Unlike Humans, Saiyans remain in their youth and prime
> much longer. As explained by Vegeta near the end of Dragon Ball Z, they stay
> young longer because they live for and are built for battle

From [Saiyan](http://dragonball.wikia.com/wiki/Saiyan) article on Dragon Ball
wiki. (Visit the link for more examples, and a more definitive explanation).

Something else to consider: they stay in their prime longer because they are
full Saiyans, whereas Pan is only quarter Saiyan.

