Aww, age is a relative term now. Generally speaking, we don't look like our parents when they were 50. We are fitter, healthier, usually don't have gray or white hair unless we want to have gray or white hair, and have a different mindset about our activity level, our vacations, our careers, retirement, home ownership, and various other markers of success and recreation.
How old we think we are determines how old we act in most cases, in the absence of serious illness which has obvious manifestations. I don't belong with the teens twerking at the clubs but I also don't belong in AARP or with a Lifeline or a walk in tub or a hundred different spam emails I get every day.
Not even a doctor can tell you you're old if you don't believe it. My doctor is my age, born in my birth year. I chose him years ago on purpose so he couldn't throw ageism in my face if I had a complaint of a sore knee or back pain one day. Thus far, he and I are both utterly healthy and fit human beings.
You aren't old unless you think you are!