The story I've heard is Delta isn't any more deadly to the over 50 crowd, but it's definitely more deadly to the under 50 crowd. I understand there's been a surge of younger adults going to the hospitals and ICUs and young children are filling up the children's hospitals. I suspect the younger people respond better to treatment, but I don't have any stats to reinforce that suspicion. Even so, they're filling hospitals and there have already been cases where people having non-Covid related issues have died while trying to find a hospital able to admit them. It's a mess.

That story isn't backed up by any numbers I've seen.