How old can Trolls get?


Trolls have an insane regenerative ability, being able to regain lost hitpoints in a flash and even regrow lost bodyparts. My question: Does this have any effect on their lifespan? I understand that the average troll is unlikely to live a long and healthy life due to their tendency for combat, but presume a Troll that is either strong enough to win all these battles, or peaceful/lucky enough to never run into a fight. What is the maximum age a Troll could possibly (naturally) reach?

Answers from any official source, regardless of edition are welcome.