.Rats are clean, lively, personable, and make lovely pets. In our family, the longest lived was about four years old when she died. Usually they lived about 3.5. I think much depends on the quality of food, and yes, even attention. Ours would ride round on our shoulders, in pockets, and crawl over Gram. They even liked our dogs, and our dogs tolerated them.
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Rats live 2 - 4 years on adverage. If you are looking for a rat I would suggest getting it from a breeder, not a pet store
Pet rats usually live in between two and three years, but with REALLY good care, they can live up to five years!!! :)