Older ones can? Not really, I think due to their age & experiences in life, they know how to operate to notmake people think something. But overall, for any age it can be an issue. It's a touchy situation anyway. My experience is, to have such a relationship, the other half, your signifcant other, needs to be a part of this friendship too. Interference from her family, is always the worse for the other person (you), but a support for the one feeling threatened, (her).
In the future, always take your partner's feelings into consideration. If she has outside male friends and it doesn't bother you, it should then go both ways. Put yourself in her shoes and think about how you would feel. Discuss it thoroughly and make sure all are in agreement.
Regarding the congregation, I personally think it's none of their business, unless someone get's hurt, but then again, nothing should be the cong. business at all. It's a personal issue period.
Good luck!
LINDA