To trim hair or not to trim hair?

If you wait for a while without getting a hair trim will it hurt your hair even though its not damaged, lets say one year without trimming will it hurt?

do you mean tha hair on you head?!
if yes, then it should be ok.
and trimming hair doesnt and shouldnt hurt...
its only if your hair in in crap condition, or has lplit ends. you cutt them off so the hair stays healthy and can grow normally

It wont 'hurt' but it wouldn't be healthy for your hair.
Your hair could still look completely healthy, but if you look at the tips after a while you will start to notice split/dead ends and that isn't good. Those need to be trimmed off in order to keep your hair healthy. If you are trying to grow your hair, I suggest regular trims, it will help.