This is a sad statement. These are normal bodily functions. If a couple explores and expands their sexual relationship , both should be satisfied throughout life. Without any long disruption. Why should this very simple pleasure be left behind.
Vaginal lubrication depends upon stimuli.
Look at your feelings about your partner and your feelings about sexual intercourse. Find and do exercises that bring blood flow to the pelvis. If you need a transitional lubrication for a while -use one and saliva works too. Atrophy is just what it says- if you don't use it , you lose it. This goes for every body part, mind and soul.