Well bully for you pen50! Perhaps it has escaped your notice that a lot of people age at different rates to others owing to health issues such as T.M suffers from, genetic makeup, metabolism and family constitution. Walking holidays and a hectic lifestyle together a careful diet (diabetes requires that) can hardly be described as slothful!
I would suggest that dancing is not TM's forte and probably never has been, it's not mine, and never has been, and that her awkwardness is due to that and the effects of type 1 diabetes. Judging other people by yourself without the relevant knowledge of that person can be misinformed at best, and pretty unkind at worse.