This is what safe-access-for-all looks like. This woman told me that she has trouble walking and this folding e-trike is her mobility device. The protected bike lane, which connects to both Piedmont Park and the Atlanta Beltline (and beyond), makes the city accessible. (And I love how she scans over her shoulder for the approaching bike rider before making the upcoming turn.) A recent survey in London showed that almost 25% of bike riders use bikes/trikes in place of wheelchairs, walkers, etc. If you are not seeing seniors and others with disabilities on bikes and trikes in your city, your city is not accessible for all, and definitely not bike-friendly.
For rubber-hits-the-road ways to encourage more seniors to try adult tricycles, see my FREE Seniors-on-Trikes Recommendations (based on a class I taught for a year) in the Bonus Resources section of this website. Also, see stories about that class (and more) in my book, Traveling at the Speed of Bike.
If you are a state or city planner or representative, do yourself a favor and see this related post, A Gift to Your Future Self.