Because the FHSS systems are using much (or all) of the band, there are situations where they can be badly affected while a DSSS system is not affected at all. This can occur if the band is heavily congested except for a small portion and the DSSS system chooses that portion on which to operate.
Spotted seatrout (specks) in Louisiana seldom survive past age 5, tunas are old at age 12, and redfish may live about 40 years at the maximum. The oldest red snapper reported in the scientific literature is an individual sampled in February 1991.
This completely depends on the species of fish. Goldfish will live 20-30 years and grow to be a foot long, if you let them. Most die within a few years because people don't look after them well. Fish need bigger tanks as they grow; it is a common misconception that fish only grow to the size of their container.