You do realize that up until maybe 15 or 20 years ago, oral sex was not something that was done by every couple, and it is certainly not the norm among most older couples even now. That’s not to say that all the older men would be displeased if their partners gave them oral sex, as you are willing to do to yours, but they had what they would consider good sex lives without it. And even among men who do enjoy it, that doesn’t mean it is their favorite sexual act, but just a part of their overall sex life.