For me after turning 30, I think the next big life change was when I hit 50. 30 to 49 was a cake walk, then life becomes unsettled again for a little while, you have to really think about retirement, to wonder did you do the right things, did you save enough, how much longer will you be allowed or able to work. 50 was the next part of looking forward, not just living and having fun, it was the buckle down year for me.