It's all a matter of personal preferences and what types of exercise and recreation one likes to do.
I know people who are avid walkers and who play golf--walking--well into their 90's, but they would end up dead or in a nursing home if their physical activity were shoveling snow, pushing a snowblower into wet, heavy snow that's a foot deep...or if they need an ambulance because they fell on ICE at the front door but the snowplows have not come thru yet, and it's too cold for salt to work...or if the city or township's budget for salt or plowing is exhausted two months early--as it's been in recent years where we came from.
Other seniors are competitive swimmers, rowers, bicyclists into their final years. Those possibilities year round are remote in the northern states and Canada.
And everyone loses bone density as they age, and the best way to get Vitamin D is walking in the morning or late p.m. sun with some skin exposed for as little as 20 minutes a day--the body cranks it out much better than it takes in supplements. See
http://www.vitamindcouncil.org/