We are tought that masturbation, in all cases, is forbidden, because sex is only intended for procreation.
But, can couples, over 60 years old procreate?
Can masturbation save a marrage, by eliminating the temptation for adultery?
Is masturbation allowed for specific , personal situations, like when one of the spouse, mostly woman, are frigid , because of old age?

It is never permissible, and it is always destructive of real relationships, no matter what age of the persons involved.