My missus has been drafted on to the covid wards at whiston hospital to help due to staff shortages (covid related). The wards are all full with covid patients and her ward only has 2 people over 60. The youngest patient in there is 26.
It is undoubtably affecting younger people more this time and lots do require hospitalisation.
My housemate works on the covid wards in Sheffield and has treated one person under 30 - and they were 25 stone. Fortunately, they lived.
My point being, there's no set in stone rule for this (which is a worry). But you are much more likely to be able to not have to be in hospital if you're younger/no conditions. It's the underlying conditions that are the worst factor - again it's what the virus can attack. I think the other day when 1600+ deaths were reported over the 28-day cut off, approx 30 had no underlying conditions. That's 2%, tops, and I don't think 'underlying conditions' will include stuff like smoking etc which sadly will be a massive contributor if your lungs are knackered.
Not saying this shouldn't be taken seriously or anything or saying you're wrong.
Perhaps more younger people are getting the virus now as they are the ones out and about - are they the ones working still in terms of going into places? I don't know, we'd need to see the proper figures. It could also be that to be cautious (rather be safe than sorry) they are getting people into the wards to make sure they have the care they need?