Ha you remind me of me! I know when my horses birthday is because its written on his passport (along with the date when he was branded at five months of age - poor lad). Last year I told someone on our yard and they replied that their horse wasn't posh enough to have a birthday (it was a cob), so I kept my mouth shut after that. However this year I did celibrate with Bailey, and bought him a few extra carrots and some dates!