Dancer66-- I am about your age and have been pondering the same question.
I take no vitamins, rarely even resort to an aspirin for a headache, do plenty of exercise, eat healthily and have always been slim and agile. However, lately, I have noticed the odd twinge in the knees and the beginnings of arthritis in my wrists, thumbs and one big toe. Are the effects of age creeping up on me???
Compared to dear friends , some of whom have suffered terrible ill health, I have been lucky so far. Perhaps, however, it is time to consider taking something..at least to protect joints.
Do they really help, however? 
From the above posts, the message seems to be that Cod Liver Oil and Vitamin D are must haves at our age......