If I look at my friends in that cohort, they're playing 5e with their grandkids and are using Wizards material to do it, so they seem to be covered actually.What do the over 55 crowd want?
(Snark aside - I think aiming at age demographics is a fools errand here - aiming at play experiences is a better approach. The OSR folks are definitely aiming at older style play experiences and those products cross age demographics. I've had discussions with 20 year olds who love OSR stuff but my 50 year old friends wouldn't play a campaign in an edition published before 4e if you paid them at this point. Trying to lump the over 55 crowd into a monolithic target audience doesn't seem like a good idea to me.)