Death rates aside, it looks like younger people are less likely to even get the disease (not especially surprising). If you exclude the really young people, even the 30 year olds would likely be under represented (I think). One implication of this may be that societies with more socially engaged older people will be more vulnerable to this. E.g. countries where people who serve as frequent touch points to strangers like frontline retail jobs are likely to be older might do worse in this circumstance.