all dbz fans here

[sadbhav]

i wish there isnt but in db gt bulma says that vegeta can go ssj5 with a machine(the machine that makes vegeta ssj4)

You must've mis-heard, There is no mention of SSJ5 in DBGT. Because, I distinctly remember her saying about the golden great ape and SSJ4, but not the fifth level.

and somthing else when vegito was inside buu why did the fusion stop

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Buu's stomach acid dissolved the effects of the Fusion, apparently.

Alternatively, you can take the explanation of Buu's body being a separate dimension in itself where the laws of other dimensions o not effect the one in Buu's body.

in dbz budokia ten.....(dont know the name right) 3 the ps2 game chichi says that saiyans dont age but in db gt movie there is only goku why?

Saiyans do age, actually. But they age very, very slowly.
Vegeta is older than goku by 10 or 11 years (I think) and Gohan, Goten, Trunks are all half saiyans. I havn't seen the movies, I'm just telling the facts XD