Today isn't my birthday, just something I've thought about in the past.
Personally, me and my friends don't really exchange gifts on eachother's birthdays, but I always make the effort to at least give them a call to wish them a happy one/leave a message doing so.
They're good people and I love em', but overall they very rarely return the favor, and it kinda hurts my feelings ngl.
I have adhd and bad time blindness and I've forgotten my own birthday before. I miss a lot of stuff like that, especially with covid cause once people are out of sight they totally slip my mind no matter how much I care about them, and as I've gotten older I'm pretty sure that makes me a bad friend to a lot of people — the ones that stick around aren't bothered by it.
You might want to tell them it bothers you, if someone I considered myself close with mentioned in passing that lack of birthday calls/texts disappointed them I'd make an effort to remember for the next year. Especially cause I assume most people are like me and find answering birthday calls and texts to be a lot of work especially for a day that's nominally supposed to be about me.
Time blindness.. that's a great way to describe it ive never heard that. Personally, I set reminders on my phone for a few of my friends who I know care about that stuff. I still have to ask my mom where I was born and other similar nonesense every time I fill out government forms. Gonna be tough when she's gone.