Why use the language of the leftists? Call your boyfriend your boyfriend and leave the word partner in the dust.
He is a 78 year old MAN, not a boy, and I won’t insult his manhood by calling him a BOYfriend. If anything I would prefer LOver, but that offends some people, and what we have is so much more. I hope your female friend, if you have one, is a woman not a girl unless you are under 21.