Our Marmorata is a female ~ so no beard! She's over 6 yrs old - about 14" now. I think Taz has a male Cincta several years old. Pikes can live up to 12 years!
Aye, pikes can really be up there in years. I had my belly crawler for four years before I sold him.
I guess noone can know for sure, as I don't think anyone has kept them long enough yet for them to die of old age...lol. Its possible a very long time.