My birthday is on August 8. My aunt, my father's sister was born on August 10. I could not for the life of me figure out how she was older than me. By my reasoning, if you were born on May 6th, you should be older than someone born January 20th. If you were born September 17th, then you should be younger than someone born June 9th.
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...**\\