Pretty old...they were all born in the late 1980s. 3 of them met up in dance class.... and they became friends and have been together since they were little.
There is no clear answer, some youngins are old and some oldins are young. Another opinion: At least 80. On the lighter side. This answer was kindly dedicated to Lazarus
it is 7 years please be aware that when it gets out of shape it hurts your back so please go buy one that is sutible for a long time-tempurpedic is the best !