Yes, I think it is. Lust is very strong and sometimes just being close can bring it on. Hence the cautionary advice for most monastics.
Generally when we are younger, passion plays a great role, but as we get older, men and women, we tend to either lesson or make do without. Only some people though, and that relates to their character or personality or other social and health factors. Others are at it in their eighties!
Desire cannot be burnt out with age, (ask the old boys visiting strip clubs) and one is motivated by desire. Still, in many situations, the emphasis can shift to one of security and companionship, to avoid loneliness and insecurity, as some get past middle age.
Quite a few are in that situation you mentioned. There are also married monks purely because they can travel the Path with or without a companion. They do not indulge, but travel the journey together like brother and sister.
How are you today Clive? Long weekend for me here in London, UK. Have a great one.