I personally have never had my parents change my diapers as a kid or teenager but I did secretly wear diapers without my parents knowing after I was potty trained.
My little brother had diapers because he was still 2 years old and I would get his diapers and put some on myself and I would also sometimes take his wet diapers out of the trash and put them on myself and they felt so good.
The diapers that he wore were those old Pampers Diapers that were all thick and plastic backed and crinkly and those were great diapers.
I used to easily fit into his diapers when I was 6 and 7 and 8 years old but the diapers went away after he was potty trained and that was sad.
So I had to go to the store with my mom and I would sneak diapers into her cart and then amazingly she didn't know about it.
That is until eventually she realized diapers were listed on her receipt and she called the store up and then they found out it was me.
I got into trouble for that.
But that's okay I now wear diapers full time as an adult and would never go back to using the toilet.
If I had kids I would keep the kids in diapers full time and never potty train them.