In the scientific method, Occam's razor is not considered an irrefutable principle of logic or a scientific result; the preference for simplicity in the scientific method is based on the falsifiability criterion.
Many freshwater fish average about 1 to 3 years of life. Some of the more popular species with this short life span include fantail guppies, swordtail platy, mollies, rainbow fish, hatchet fish, corydoras catfish, some cichlids, rasboras and tiger barbs. There are also several fish that live around 3 to 5 years, with proper care and feeding.
The average lifespan of a goldfish is about 10-15 months with improper care. Many die before that because of poor care such as overfeeding, having too small of a fish tank, not having a good enough filter, forgetting to feed them, ETC. The oldest recorded goldfish lived to be 44 years old but died in 2003.