Milestones are triggering, if you ask me. An unconscious reevaluation. Im 46. I took 40 very seriously. I am happy that I decided to take myself more seriously and other people less seriously, weigh my life experience and my achievements (I would have said I didn’t have any) demand to be taken more seriously. I thought 40 was my first taste of being old; at 46 I think 40 and until now are probably last licks of being young. Maybe someone older has more insight.