That is what happened to my father.  I was diagnosed when i was about 4 years old meaning he had to be atleast a carrier because his sister had it along with his mother. After looking back he think he did have it because he was very tall at a young age that stopped growing early and other things like that. To this day my father is not being treated and has never really seen a doctor about it although he has metioned it to mine. he just turned 45 and back then he never though anything of it