What on God's green earth are you even talking about?
Covid certainly can, and does, infect those demographics. But Covid's impact on those demographics is far less impactful than it is on an 84 year old diabetic woman living her last few months of life in a Nursing Home.
We all make personal risk analysis on things. I think all of us have looked at the actual Science & Data on Covid and realized that if you have no co-morbidities that Covid is not going to kill you.
This type of personal risk analysis on Covid is exactly what Governor Newsom and First Partner did at The French Laundry back in November. They are both very smart people, who have all the latest data on Covid at their fingertips, and they knew that as very healthy people in their early 50's there was very little risk of Covid if they were to catch it at a dinner party. So they went. And even sat right next to the President of the California Medical Association at the same table for that long indoor maskless dinner party for 12. They did the risk analysis and they knew the risk to them personally was acceptable; if they got Covid they would probably get cold or flu symptoms, but not die. They might not even get symptoms, as many folks infected with Covid don't.
This type of dinner party shown below, not unlike ones I went to this past holiday season (but without those fabulous blue velvet chairs), should be up to each individual to make their own decision on whether or not to attend, based on their own health and risk analysis.