How old is the furball?

How long has he had this?

If he has had since he was young. There is a parasite that young cats gets
I forgot the name but it won't show up in routine testing it can cause
diarrhea and problems in the that area

No idea how old he is as he was a stray, but I'd guess about 4 years
old. He didn't have it when we first had him, but he's had this now
for over a year.