And that is why we look at rates rather than raw figures. E.g. per 100,000 people 65-70, how many died.
you didn't look at rates, you very specifcally said that 99% of PEOPLE THAT DIED were less than 65. you didn't say 8% of over 65's died, or 100% of over 65's died, just that most of those that did die weren't over 65.
There probably weren't over 100,000 people in the USA that were over 65, did you miss that part at all? The life expectancy of people born in 1917 was expected to be 50(for males). THat means those BORN in 1917 without living through earlier dirtier harder years WOULDN'T be expected to live past 50, those already 25, wouldn't have be expected to make it past a lower number.
SO its perfectly possible that the number of people over 65 was less say 0.5% of the population, and that 0.4% of all people over 65 died from it, however the only stat you show is that 99% of people that died from it where younger than 65, not suprising, again, because 99% of the population in the world were under 65.
Its also worth pointing out that those in the first wave, were immune from the second wave which was far more deadly. Its perfectly possible that the older people were more susceptible to actually catching the virus due to weakened immune systems, but because it was weaker and not very deadly, they all became immune to it, which is perfectly reasonable and follows normal flu patterns. When the second incredibly deadly and contagious version, the strong immune systems that kept them from even getting it, stopped the stronger people having immunity, hence the data.
Its also worth noting that very VERY similar outbreaks of VERY similar viruses occured decades before. a 20 year old wouldn't have been alive for those outbreaks, a 65year old WOULD HAVE BEEN and so could have had immunity for decades before.
Theres a tonne of reasons why older people wouldn't have been effected as badly, but theres no data I can find that suggests what the mortality rate officially was for the over 65's, even if it was significantly lower, previous immunity is a VERY valid reason for such stats.