The fastest growing training population is clients over 55 years of age. As this population grows, so does the need for experienced trainers who understand the dynamics of training this group. From the initial assessment to designing a training program and addressing any ailments or illnesses the client(s) may bring.
All my clients gross train no matter what their age. The program design depends on their initial assessment.
55 is not old (I am not far from that number myself) and many of us a super fit and very active.
I guess my answer would be no.