Ideas for Geezer-Based Income

I am a believe in trying to take advantage of opportunities by filling emerging needs...not that I've ever had the resources to actually invest the necessary capital to do so. However, if I ever find myself in a position of having resources to address some of these needs, I think it's a safe bet I could recover my investment and make a handsome profit. Don't you agree?

• Help aging people maintain their independence in their multi-story homes by installing personal elevators in existing homes...it's being done.
  
• Sell magnifiers, etc. for books, forms, websites, etc. for people whose eyesight is weakening.
  
• Create localized database of services of particular interest to older people, e.g., lawncare, house-sitting, handy-man service, errand service, general support organizations, etc.
  
• Publish Consumer Reports type assessments of investment companies, annuities, retirement communities, nursing homes, assisted living facilities, etc.

I'm interested in getting more feedback...more ideas. Where can we invest to maximize the likelihood of good return, while simultaneously looking out after the interests of geezers, would-be geezers, etc.?