Without getting into specifics and to avoid being political, I will say that in my very small sample size, it seems political beliefs and primary news sources are having an effect.
I saw a poll this past weekend that indicated the perceived threat of the Coronavirus was divided along political lines. I would be curious to see that same poll conducted again right now.
Another factor I believe, is that many Baby Boomers do not believe they are "elderly". They are "forever young". It seems people are behaving that at risk groups are "the elderly WITH health conditions" instead of "the elderly AND those with health conditions".
It's obvious to me why college aged kids tend not to take this as seriously. It's nothing unique to their specific generation. Especially in the modern era, most people in the age range of "not a child, but not fully an adult" are just dumb and reckless, thinking they will live forever. I was, my Dad was, his Dad was. It's a phase most of us go through to some extent until we have "real" responsibilities.