Turning 18 is a big thing. It means adulthood, emancipation, legal voting age (not necessarily legal drinking age for all), and a general sense of having reached a state of maturity and responsibility.
28, 38, 48, 58, ... none of the 8s seem to be as big as 18. As for this year, I know I'm two years till the big Four O, and really, each day should be a celebration of what I still have (all my hair, all my teeth, hearing is still sound, aches and pains aren't insurmountable, and the general decent health report).
So to me on my 38th, thanks for staying intact and working ok. Keep smiling through the next 365 days.