They can live for 10-15 years with proper care.
By Mr. Glenn Barrett - en:Image:A calvus.png, CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=1033666
They can live for 8-10 years.
By The original uploader was MidgleyDJ at English Wikipedia - Transferred from en.wikipedia to Commons., CC BY-SA 2.5, https://commons.wikimedia.org/w/index.php?curid=1884798