When I was little and I asked my mom what year she was born in, she would consistently and earnestly answer 1961. My dad was born in 1950, and was forthcoming about it. For some reason, I mentally created two categories of grown-ups: "Young" (born 1950 or later) and "Old" (born anytime before 1950), and I was thrilled that both my parents were "young." Imagine my horror when my mom started telling me the real year she was born: 1948. I was probably 8 or 9 by then, and I refused to believe her for at least two more years until I was doing a family tree for school and I demanded she tell me the truth so I could get a good grade. Oddly enough, she's a high school teacher and most of her students refuse to believe she's in her 50s, so maybe it's not just me!
A childhood belief about family

others believed things like this
- I used to believe that I was older than my brother because I was born in June and he was born in OctoberAnon
- When I was young I used to believe for some reason that being asthmatic meant you were born with no lungs.Anon
- i used to believe that everyone was born as the opposite sex, and that you changed when you started school.— llama
- i believe that if im born in december im older then people born in may— runawayfox16
- I used to believe that people born on leap year would only age once every 4 yearsAnon
- In the mid 90's, I used to believe that babies who were born in the year 2000 would live forever.Anon