My question is, why did I get ME/CFS at the same age as Dad got it?

And he is a Navy veteran of the Cold War & Vietnam era & has been to lots of other countries.
I have never been in the military and have not been to any other country.

We were talking on phone, again, about all that one day last week & Dad reiterated that both some of his health care providers & some Saudis he still knows have strong suspicion that he got it from a pathogen, virus, something, endemic to Saudi Arabia that people there have a natural immunity to but us folks from different continents do not.
I was in that life period of finishing high school and entering college during the early 1980s when Dad was with the US Navy's SNEP FIT program based in Virginia, Saudi Navy Expansion Program - Fleet Introductory Training
IF it was a case of Dad brought the pathogen home, and I was exposed that way,
WHY was it over 20 years before I showed symptoms?
WHY did I show symptoms at the same age Dad did?
What's up with that?
How does THAT work?
And that 22 year delay is even weirder when considering Dad had always had superb health up to the time of ME/CFS, farm kid, school athlete, college athlete, military Officer.
While my health has been a lesser or greater degree of imperfect since the day I was born.
