It’s something teachers and my old fashioned parents said when I was a young teen, “You’ll change your mind about X… when you grow up”. Another variant was related to parenting “When you grow older, you’ll thank us for x…”
Now, it would be fair to say a good majority of people actually turn out like their parents in terms of basic opinions and being like other adults in society. To a certain degree, it’s natural to change as being an adult requires learning from mistaken beliefs that can only be done through trial and error and also a certain basic minimum form of compliance with society even with people you disagree with.
For myself, it was 1.) not wanting kids and getting sterilized 2.) being a liberal, open minded person (rejecting “tough love” too often). Perhaps I’m a bit too young to be certain of number 2 since I know people who were just like me saying the same things but later fell-back on their parents beliefs.
At about age 10 or 11, I started to discover that religion is a con game. That upset my parents greatly, as they both believed, and I remember my mother telling me that I would regret this and see the “truth” as I got older.
“Not wanting kids” for me also. Although I actually did wind up having kids, and it wasn’t horrible and I do love them, I think I could easily have been happy all my life and never felt the need to reproduce.
I love to read, especially the scary stuff.
I don’t like tattoos.
I can’t think of a single other thing I haven’t changed my mind about, so I guess it’s a good thing I didn’t get any tattoos!
While I definitely have changed some opinions since I was a teen, I have not changed opinions on the things they said I would - the things that were most directly about teenagers. I still don’t like curfew/cruising laws, I still am not a huge fan of school dress code/uniforms excepting as needed regarding gang colors, offensive language, etc. and not length of shorts, color of hair, or width of shoulder straps (then, as now, it’s not a big deal to me), and I still think a child has a right to privacy from their parents regarding their body, their diary (now texts, etc.) unless the parents have a reason to suspect they are a danger to themselves or others.
It doesn’t particularly bother me if my kids see nudity or hear bad language from R-rated movies. I do, however, try and shield my youngest (11yo) from gratuitous violence in media which, ironically, my parents were more or less indifferent to.
I still think that the young are unjustly disadvantaged when it comes to legal rights.
As a teenager, I was incensed that people my age could not legally vote, but could be tried as adults for crimes.
It’s illegal to discriminate against someone for their age if they’re old. Discrimination against the young is legal.
I was told that I’d realize it was better that way when I was older. Nope. Still think that’s unjust and wrong.
Also, atheism, although I don’t know that anyone credible ever told me I’d grow out of that. Like, my parents were dismayed, but because they didn’t think it was a phase.