Do you guys not remember how old you are year to year? Are you frequently calculating your age from your birth year instead of just adding 1 to it on your birthday?
I find that the older I get, the less I discuss or think about my age throughout the year so it gets more difficult to remember. Also, my birthday is in January so it’s over pretty quickly and I don’t tend to think about it again while I’m busy thinking about my 4 kids birthdays that are coming up, instead!