Yes, today's seniors view retirement as the chance to do all the fun stuff they didn't have time for previously, whereas older generations were generally content with more restful pastimes. This is due to better general health, allowing seniors to do things their parents couldn't do at that age. Another factor is greater financial freedom thanks to the prevalence of 401K and IRA plans.
Older people now have their own savings which they can spend and retire on. Their lifestyle gives them a huge amount of leisure time and they are choosing to spend it drinking beer and engaging in sexual relations. It's their prerogative how they want to lead their lives, however, they should be taught to lead healthy yet fun lifestyles.
It is difficult to know how active older people were in previous generations, this makes a solid comparison difficult. These days there are lots of activity clubs, organised day trips and many things elderly people can do. If they are drinking beer you would hope it is social, and the STD rate implies socialising is something that is common if STDs are being passed around. These facts imply older people are quite active today, maybe more so than previous generations who had less to do.
This statement is based on just one senior community. This data can's be used to make a general statement. Most of the time these days, as people get over 55, they are getting more health problems. Earlier generation was much healthier than the current one due to lifestyle changes, pollution and stress levels. If anything, the older people will be less active.