 Tarantulas may live for years; most species take two to five years to reach adulthood, but some species may take up to 10 years to reach full maturity.Upon reaching adulthood, males typically have but a 1.0- to 1.5-year period left to live and immediately go in search of a female with which to mate.Male tarantulas rarely molt again once they reach adulthood, but they may attempt to do so, usually becoming stuck during the molt due to their sexual organs and dying in the process.