It is OK for adults to wear diapers and even kids, teens etc.
Anyone of any age can wear diapers and they should if they want to wear them.
I'm an adult who now wears diapers full time and would never want to go back to underwear as diapers are much more comfortable and I no longer use the toilet for either poop or pee.
I do all my poop and pee in my diaper and I'm happier doing so.
I love walking around and sitting in a poop diaper and a nice wet diaper as well.
