Yes 13 year olds should wear diapers if they want to wear diapers or if they need to wear diapers.
Diapers are for all ages and no matter your age you can and should wear diapers.
Diapers are much better than the toilet.
You can go pee or poop wherever and whenever you want and not have to run to the toilet because the diaper is a wearable toilet.
I gave up the toilet almost 9 years ago now and I wear diapers full time and use them too.
I think all 13 year old boys and girls should be wearing diapers.
Especially the boys should be in diapers full time.
Diapers are great and I hate underwear now that I wear diapers.