I think 25 is the last age worth turning.  Everything after that is downhill. 

When you turn 10, you finally reach double digits.  When you turn 13, you have a Bar Mitzvah (if you're Jewish, which I'm not).  When you turn 16/17, you get to drive.  When you turn 18, you get to buy cigars and operate a meat slicer, and you can be tried for crimes as an adult (yay!).  When you turn 21, you get to drink legally.  When you turn 25, you can rent a car and get lower car insurance rates. 

What's after that?  At 30, your metabolism shuts down and you gain weight uncontrollably.  At 40, you're ... well ... 40.  You have a mid-life crisis, you lose your hair, your waistline, your youth.  At 50, you're a senior citizen.  At 60, I suppose retiring and collecting social security benefits are good, but I hardly think they outweigh the downsides of being in your 60s.  At 70, you buy a Chrysler, paint your walls puke green, wear pants up to your chin, and move to a warm climate.  Everything above 70 is essentially the same; whether you're 85 or 185, it doesn't make much of a difference. 

I say this half-jokingly and in good humor, mainly because I recently turned 25, and partly because everyone I know is over 25, so I expect a ton of backlash from this post. #lifestyle