The funny thing with me is that I always overstate my age.
The day after my 53rd birthday, for example, I always think of myself as 54, since I've passed 53, so if anyone asks my age, I say, "I'm 54," when really I haven't reached 54 yet.
That's only one year, that's not so bad, but a couple of months after doing that, I start thinking I've already had my 54th birthday, because I've been saying "54" so much, and I begin to think I'm on my way to 55, and so I answer "55" if anyone asks my age.
So on and so forth that by the time my actual 54th birthday rolls around, I think I'm about 57 or so, and then I have to do the math and say, "...wait a minute, I thought I was 57 turning 58, but I'm actually 53 turning 54...that can't be right?!"
When we're out together and someone asks my age, my wife always answers for me before I can, because she knows I'll get it wrong.