What's Russian Dwarf Hamsters Lifespan? You need to put this into consideration when getting a pet hamster. Generally, hamsters have a short lifespan. That their lifespan averages 2 years doesn’t imply it won’t die before 1 or 2 years. Nevertheless, if you big hamster may prolong the longevity of your dwarf hamsters by how well you care for them. With proper care and fixed therapy from a vet. Your hamsters can't only dwell longer but also stay healthy, fun, and joyful.