Good for you for wanting to help older people! Look at the top right-hand corner of this page. See "Business Center"? Click on that and it will take you to: https://business.angieslist.com/default.aspx You can register your business there, for free!
btw, I suggest you not say that you say you "TARGET [older people]" in the description of your business. ;-)
You asked this question almost two years ago. Please do let us know how it's working out.