60,000 die of flu/pneumonia in the US every year. why is this different? just because of the affected age-groups?
The reason this is different is that bad damage is done when a new flu circulates that the population has little immunologic experience with, that is, people are naive to the virus.
Influenza always kills the weak, the infirm, the very old and the very young, but if the protein parts of the virus that induce the immune response are in a new configuration, we're playing catch-up.
Public health officials are in a tough spot: if they don't say too much and all hell breaks loose, they're blamed (and why Napolitano at Homeland Security is making the pronouncements on this is crazy). Or, if they start to ramp up precautions and nothing happens, they're chicken little.
Sorta like the FDA and drug approvals: too fast, and some side effects come out, they're idiots. Too slow, and the Wall St Journal denounces them in an editorial. Life is complicated...