I doubt he'd care anyway, he'd probably be relieved if he's not a birthday person.
If you want people, anyone at all, to make a fuss of your birthday you must remind them one week before. Yep, sorry, that's how it goes.
Many people, for example me, give zero shits about birthdays and honestly just forget about them. The only birthdays I could never forget are my kids because I was the one who gave birth to them and those days are firmly etched in stone. When the kids were young I had a list of birthdays of other family members, including their dad, typed up and stuck on the inside of the pantry door because I genuinely never remembered anyone's but theirs. I also give zero shits if someone forgets my birthday, and the week before it will generally send out a reminder if I want to do something, let's go for lunch for my birthday, let's do a movie - or something similar.
Fortunately, nobody plays stupid games or acts as though this is some terrible thing, we all just remind one another of birthdays coming up.
The fact is if you have not mentioned this at all in the run up it has been deliberate, you are trying to trick him and catch him out, because you are hoping to play a martyr game, play the victim card and make him feel bad. Weird behaviour and not a healthy dynamic at all.
Just remind people a week before your birthday if it matters to you. If they THEN go ahead and forget you have reason to be upset.