Tonsils are lymapthic tissue that produces white blood cells, hence why they get swollen when you have an infection.
Anyhow, I got mine out at 19 if you consider that an adult.
It hurt like hell, not going to lie to you. But, if yours are anything like mine were it was worth every penny.
I had absolutely huge ones, even when not sick they were much larger than what some people had with an infection.
I was out, oh I dunno almost three weeks. The first week sucks big time. You know the story about oh yea you can eat all the ice cream you want. Bunch of crap, I had trouble drinking water.
My morning ritual was getting up and take many swings out of a tylenol/codiene liquid mix; that was the best part to be honest.
I dropped quite a bit of weight simply from not eating.
So, even at 19 it really sucked, but as somebody else mentioned if I had to do it all over again I would. Besides the occasional allergy flare-up or just winter sniffles I have not had any throat type infection since then, vs. beforehand I got strep throat once or twice a year, plus other infections.