When I was a kid my good friend who was a couple years younger than me couldn't understand how I was older than her if her birthday was before mine. Her birthday was actually a couple of weeks before mine, she just didn't understand that I was born a couple of years before her.
A childhood belief about birthdays

you weren't the only one
26 of you believed this
- I used to believe that I was older than my brother because I was born in June and he was born in OctoberAnon
- i used to think that i was older than my dad because my birthday was before his— zara
- My cousic used to think he was older than me because his birthday was in June and mine was in December.— //**...Ethan...**\\