Very few small mammals make it past the single-digit birthdays. Lab mice rarely live to be three. Small animal species, in general, live much shorter lives than their large-bodied relatives. Humans, the Galapagos tortoise and several types of whales can live 100-plus years.
There are, of course, exceptions to the rule. The fat-tailed dwarf lemur is one of those exceptions, capable of living to nearly 30 years old -- three to four times the lifespan of its miniature-sized peers.