Thirty is fine...you're still young...but now you are an adult...at least accepted as one.
40 was the age to be .... 45 actually. You had arrived!
50... I celebrated to show how young I was at 50.
60.... makes you stop and think...but then so what!
Now 65 is good and difficult to accept. The best part of 65 is "Dang it ...I've lived this long and I'll say and do what I want!"
The bad part is the body is not as young as I am.