Life expectancy of clams?

[Vincerama2]

Hi, just wondering what the average lifespan of a happy clam is. All species. (Except the ones on the buffet table at Red Lobster)

V

[Gatorfan]

I'm pretty sure I remember reading a couple T. Gigas at a public aquarium that were 20+

[Typhon]

I think kept is the right conditions, clams can live over 100 yrs. I have to check my copy of "Giant Clams" by Daniel Knop to make sure.