I wouldn’t buy fish from anybody that would say fish don’t age. Because you’re ether a liar or desperately confused. Tell you what, take one of your mollies, put in a separate aquarium, keep it well fed and clean and uncontaminated by other fish and tell me in 5 years if it’s still alive. It won’t be, and it will have died of old age. Because fish age.
I have had mollies live for 10 years. They died from water contamination.
This is fascinating. There are a few lunkheads here who do not care to do any research but simply shoot straight out of their empty heads.
Some fish die from genetic anomoly, weak genes resulting in organ failure. This is not the same as aging in which cells fail to reproduce, skin loses its elasticity and so forth. There are substantial differences between warm and cold blooded animals. The aging process is one.