Yes, currently I am 15 and a half, but from my looks I haven't aged very well.
It really doesn't mess any with gov. id's and such, my drivers license always expires on the 28th of Feb. in what ever year it is due to renew. Not sure if all the other folks licenses are like that or not, expiring on the day before your birthday.
Right now, two of my four kids have had more birthdays than me, one has 16 the other 20. The girls are catching up quickly as well at 14 and 11. So it won't be to many more years when I will be back to being the "youngest" in the family. The wife is the old one, she turns 50 later this month, unless she tries to hold on to that 49 forever like some women do.
With regard to years I don't get a birthday, I chose what day works best for that year.