Everone's hair has a point where it will grow and be healthy.(Different for each of us) Beyond that point, the hair gets 'old' and will break, split, frizz and just be funky hair. Floor-bound, not worth keeping. :rolleyes:
Jessica, you are fortunate to have fast growing hair and that you can get it as long as you do.
I think that terminal point 'shortens' as we age, have babies, health problems, etc.
There are several articles on the Hair site that deal with keeping healthy hair. You will find them in the Site Map under Health.