The ones who got off the island

Okey, everyone got together in the church after they had died, right, but does that mean the ones that got off the island at the end of season six did nothing else with their live? Did'nt get married, have children? Becouse Christen told Jack some had died a long time after him, so bạn think they acomplished anyting? And poor Aaron could have lived has life and went back to being unborn in puratory.