I am 60 and have been personal training and fitness coaching for over 15 years ( started late ! ) I am not against suggesting ‘ seniors ‘ how-ever your age should not define who you choose to train. My clients range from their 20’s to 70’s. Rather advertise your ‘ specialties ‘ . Where is your passion and expertise ? Mine is boot camps and boxing and kettle bells . Age has nothing to do with what I teach . And my clients respect that ( ha ha as they cannot keep up ! ) What I do also is use my real life experience to connect ( again REGARDLESS of age ! )with those in the same boat . I am a cancer survivor and have an arthritic knee, these have helped me put on the glasses that I need to see where these people are at – not all certifications can teach this. PS – when I did teach seniors I was 40. If you love what you do jump in and get wet !