Some adults do need diapers.
Although diapers are mostly worn by and needed by babies and toddlers, it is normal for some adults and older kids and teens to also need diapers.
Some adults have incontinence and need to wear diapers to keep their pants and clothes dry and some adults have bowel incontinence and not just urinary incontinence.
Diapers help to contain those bowel movements and urine output that comes out.
Diapers are made for all ages and anyone no matter what age should wear diapers when they need to wear them.
Although I'm not incontinent I will wear diapers when away from home because it's getting harder to find a toilet now and some places have their toilets locked and you have to ask for a key and sometimes I cannot hold it that long and would pee my pants.
So i wear diapers when away from home so that I can go pee without holding it as holding your pee is not good for you.
Diapers are not just for babies and you're not a baby just because you wear diapers.