But this is genetic, not professional, although sitting can aggravate it, I don’t think sitting causes it (DDD) per say, but I could be mistaken.
Zenithal was right about one thing, lower lumbar pain can be exacerbated by sitting for long hours (Especially being you’re a retired pilot, even if it’s not a factor here as you’re claiming). That Said, Not from my own experience, but from those I do know, I can tell you it’s a common attribute that a lot of officers actually experience from sitting in squads too long, especially when you add a duty belt that creates uneven seating. (Plus, if you add if that person is overweight, that also adds to lower back issues.)
But I do agree with you, some tendencies are just genetic traits/characteristics to certain default pain that you’re prone to experiencing, no matter what you do. The only real key is to ‘deal with it’ [There’s literally no other way to put that], is creating a ’Workaround’, stretching and ultimately coping with genetic pain that only you Know to manage.