I think it causes cells to age more quickly, but beyond that I'm not certain what it does. In general it probably decreases the average lifespan. If I am correct it explains why its most deadly to the elderly and the very young.
Uh...No, it does not age people. It does not age parts of their body more than normal. It in no way triggers apoptosis of cells (programmed cell death from age).
It acts like any upper respiratory flu-like infection; however, what we often see is an over-active (or hyper-active) immune response, with our own white blood cells dumping inflammatory chemicals (cytokines) into the lungs and other parts of the body, which causes both the severe respiratory illness (blocking off airways with mucous and pus (pneumonia) and damaged/scarred lung tissue.....as well as the disseminated intravascular coagulopathy (DIC) picture (tiny blood clots showering into the lungs, kidneys, brain (mini-strokes), etc...
It is more highly infectious than the normal flu, so it spreads faster, and it seems tougher for the body to kill it (which is likely why we make the big cytokine storms I outlined above).
Basically its just a monster of a flu.
No aging. The elderly are always more vulnerable to the flu every year, but every year some younger people die from the flu too.
Now just multiply their numbers by about 30.