When Keith Moreland, 58, was diagnosed in the early stages of Alzheimer’s in 2018, he noticed that friends stopped including him and his wife, Sheri, on outings.

“I would see all these posts about “Had a great time with so and so,” says Mr. Moreland, a former inventory analyst who now works with his wife at their consignment boutique in Anderson, S. C. “We’re never invited to be a part of that anymore. Maybe I don’t remember some stuff, but I’m still Keith.”

Many...