I'm posting this under "photography" since the weight of a camera seriously comes up far more often with the advent of mirrorless DSLR. And I understand that. But here's a point I'd like to make.

Ten years ago, when I taught and also broadcasted at a local radio station, on one day, I arrived an hour early. The station was on the campus of a local college, with silk smooth private street. So I brought my roller blades, and enjoyed myself before going into the building. I carried them into the studio, to a shocked announcer, 15 years younger, who ask "were you really skating on those?" Yes, was my response. He replied with "I know I'm too old to be skating on roller blades, and you certainly are too old to do that!"

To him I asked: "Did you buy a book on AGES, where each chapter tells you what you can do and can no longer do? And you believe what you read?"

As we grow older, we should not be in a super hurry to stop doing what we enjoy doing, from skating and from carrying a DSLR that we've carried for years earlier. Yes, I've stopped climbing a 20 foot ladder to clean gutters. But instead of using a snow shovel, I now use a snow blower. I'm in no hurry to give into "Mother Nature", only because others might suggest we should. Keep doing what you enjoy. My doctor reminds me that us "older folks" naturally grow weaker with our upper body muscles, and we should actually use those muscles more than before. I think of that every time I pick up my 5DII with it's battery back.

Let's exercise more, not less.