Do_Not_Taunt The three posts following yours explain most of it, however there is more, it is not wise to assume that young people will be more immune and thus translate this message into a less serious pandemic.
This disease is very infectious and young people in particular have demonstrated that a significant number are not very responsible - reinforcing the message that they personally are safe and diluting the message of how serious the infection rate is dangerous because it may translate into behaviors.
Its worth noting that when US was recording well over 1000 deaths a day, the majority of those infected were also young - even if the deaths were spread more widely across age groups.
Imagine the death rate for over 45’s is upwards of 5% - there are currently at 1.5 million ongoing cases with just 1 million resolved by death or recovery, likely very much more - I would expect that over 750k are over 45. Based only upon these speculations that are not too far beyond what is known and can be cited - that’s 37500 more deaths - and that is based on current numbers of infected, lots more will become infected in the months ahead - that number will rise.
People are simply not understanding the scale of the numbers here, making assumptions about one part of a population and then taking the optimistic view is not sensible when other sections of the community are so much more vulnerable.
The other reason is this, the virus keep on hitting us with new aspects, we now strongly suspect it attacks fine blood vessels, so for anyone with poor circulation or very overweight this is not good news and is especially bad for diabetics of any age.
The assumption that the younger part of the age range is somehow much risk reduced may also disguise the possibility of longer term damage - that information is not yet in, it would be madness to assume anything about the long terms effects except that to ensure any danger that might be presented is minimised amongst the entire population.
We also do not know how this might mutate, it may become less life threatening but more damaging to long term health.
So, these are all reasons not to make even the slightest noise that some folk can drop their guard, if you drop your guard for yourself you are in fact doing the same for every person with whom you will interact