We have a frontosa that is probably about 4/12-5 years of age. I was wondering what the average life span is for these guys? He is a real mellow fish, just kind of coasts through the water, minding his own business, except when he comes across other fish fighting. He seems to always get in the middle and break it up, then he just keeps on going. He is in a 100 gal. with other assorted africans. I never have any problems with him and other fish, of course he is so big, who's gonna get in his way?!?