Fastest growing source of CMS billings over the past 10 years and one of the top 20 causes of death overall. In the US, it seems that nosocomial cases are rising faster than expected (larger proportion of the total) which is especially worrying.

As far as the "old" crowd -- who gets sick most often?! It certainly isn't strapping young men and women, not in any hospital I've ever been in outside of a war zone.