Nothing surprising there - current estimates of the fatality rate
in the most vulnerable groups are "only" ~15% so the majority of 80+ year olds are expected to recover... and the age effect is likely correlation rather than (direct) causation - it is underlying health problems (which are far more common in older people) that are the killer.
https://ourworldindata.org/coronavirus#what-do-we-know-about-the-risk-of-dying-from-covid-19 seems like a data-rich and level-headed source.
General point:
Now, you wouldn't wish a 15% chance of death on anybody but, folks, this ain't ebola or the Andromeda strain. The
issue - and the justification for the precautions - is the potential for completely overwhelming the hospitals so that people who need treatment (for
anything) don't get it, in which case the death rate for
everything goes up.
Even "plain old flu" pushes many health services to their limit at peak season - so even if the "its no worse than regular flu" claim
were true it would be no cause for complacency. The reality is we've been walking around with fingers crossed that we don't get a nastier-than-average strain of seasonal flu... I think it
is true that, if the annual flu death toll were treated as headline news the way COVID has, we'd see a not dissimilar panic and call for action, which is something to think about going forward but doesn't make the current issues go away.