Well unless there is something "different" about you, which of course there might be, the standard answer, even back then was that you took aproximately half your pre-op dosage FOR LIFE. I'm 30 years post-op so we are contemporary.
The danger of not taking anything is osteoporosis. There are other ways to manage that, and some doctors may suggest that as a valid route I don't know, but I think its always worth checking advice like that from time to time.
I'm currently in training to be a doctor, and so not qualified to advise you, beyond the fact that it is never a bad idea to seek advice from a specialist, and indeed with a lifelong condition like this, its not at all unreasonable to look for some occasional monitoring and reassurance.