Milestone Birthdays

I'll be 30 in less than a week. I'm really not bothered by the number as some people are, but I have surprised myself by sort of taking stock of my life as it is now and thinking about where I want it to be in the next decade. I really don't know why I'm surprised, because I am one of those overly introspective people who actually look forward to making New Year's resolutions and generally just looking for any excuse to make a fresh start. Fresh starts always happen with each new year, but also my birthday, my anniversary, my kids' birthdays, Tuesdays, etc.

I've been thinking about all of the milestone birthdays. Turning 5 seemed like a big deal but I'm really not sure why, then 10 because I was finally in double digits and officially a "preteen". Then there was 13, obviously because I was officially a teenager. Next would have been 16 for being able to drive (legally), then 18 for officially being an adult (or so I thought!). 20 really wasn't a big deal, but 21 was for being able to drink alcohol (legally). Though, by that point I had really gotten all the wildness out and had been married with a child for three years. I think at 25 I felt a mild quarter life crisis. Now I'm staring in the face of 30, which I guess I feel is a milestone because it is 3 decades that I've been alive. Thinking about it, it seems that from here on out all milestone birthdays will likely be the decades. At least until retirement age, which seems to be made later and later every few years. Perhaps by the time I retire the retirement age will be 85? If I get to retire at all?