I think once you hit 21, it gets harder to remember how old you are. Lol.
Especially once you have kids! Time goes by so fast.
In order to remember my age, I have to add my DDs age to 23, which is how old I was when I had her. :)
I still haven't lived down the time I snapped at my husband while I was pregnant. We were talking on the phone, and he asked if I had paid the utility bill yet. I said that I couldn't remember, so I needed to check my email. (Which I did on my phone because we didn't have a computer at that point.) So I start looking for my phone. (We started talking about other things) After about 15 minutes of listening to me rummage around the house, and getting increasingly pissed off, he asked what I was doing. I snapped at him, "I'm looking for my f***ing phone so I can see if I paid the damn utilities!" I just hear a few seconds of silence, then, "...honey... Look at your hand." (Me, still pissed off) "yeah I see it, what about it?" (Him, very calm with repressed laughter in his voice) "OTHER hand Dear..." (Me) "....oh."