I have an online platform designed for use by baby booms & senior citizens. However since (I think?) they don't typically spend as much time online as the younger generations, then how or where can I go to effectively market to this audience online? Offline marketing suggestions are less relevant at this time, but always valued/appreciated!
You have a lot of options to market to boomers and seniors. That age group is facebook's fastest growing segment. Build ads that target that age group and think about having a facebook page to supplement your efforts there.
Older people search just like the rest of us as well, so build an adwords campaign around keywords that might align with your product.
Contact me if you'd like to chat about some options or need some help building your campaigns. Good luck!