If you operate a business or office that serves elderly persons, consider installing a family restroom or unisex bathroom. Elderly persons may be accompanied by opposite-sex partners or adult children and they may need assistance in using a public restroom. A unisex option, perhaps in addition to standard men's and women's restrooms, lets a woman help her elderly father without having to use a strictly men's restroom, for example, and your business gets credit for knowing your audience.
P.S. Don't forget the handicap grab bars for the toilets, which also help elderly persons.