Re: fitness and the generation gap
Not really, at least not in that way. It's the adjustment that a lot of people are trying to make to the big curve in technology and science advances which affect the ease of dealing with/completing tasks in every aspect of our lives.
Also, the majority of people got their daily exercises from work back then where today, the majority of peoples exercises need to come from self discipline.
We also have people living longer from medical advances.
Combine that all together, and you still have probably the same ratio of procrastinators vs. hard workers. It's just the combination of stale growth in hard labor job markets, more inexpensive 'quality of life' luxuries, and longer lives equal out to a more pronounced division of lazy to hard working people.