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Adult mice have bodies that are 3-4 inches long with 3-4 inch tails. Adult rats are far heavier and longer: they can weigh ten times as much, averaging 350-450 grams for females and 450-650 for males (with an overall range of 200-800 grams). They have 9-11 inch long bodies and 7-9 inch tails (ref).
Mice typically live between 1.5-2.5 years. For their lifespan, you will be committing to provide water, food, shelter, and lots of love. The quality and quantity of water, food, shelter, and love greatly affects the lifespan of your mice.