Vicky,
It depends very much on the particular species, and the conditions of their home.
Most killies live about as long as other tropical fish of similar size and activity level. Some favor annualism, and only live from 1.5 to 3 years, as they grow quickly and burn out earlier. Most others live from 2-5 years, depending on conditions. Keep cooler for long life, in general.
With well over 700 identified species, I am sure my generalizations are not very informative, and that some have lifespans outside my description.
Wright
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