As far as bearded dragons go, I have seen some live to be around 20yrs and I have seen some die at 30yrs. As far as your Guinea pig goes, they only live to be about 3 to 5. But if you really want to know about them, I say go and check google and search on it. I am no rodent professional and I never really had one that I can remember, but I had a friend who had they're pig til he was almost 10 so I guess its based on care/diet. I am more a bird person then a herpetologist or small mammal person. Sorry bout your pig dying tho its always a shame to lose a pet regardless of species.