I'm going to assume you neant "old" not "literally 65 years of age" when countries have a wide range of life expectancies and quality of health care. I'm not ready to say it's a specific number of years that's the make-or-break point, especially without a clear control variable. I am, however, completely on board with older people in general having worse physical conditions...but not ready to put the blame entirely there. The US has a far higher-than-average deaths per capita. We're not in the top 10, but we are in the top 20. India is not, China is not, Nigeria is not...somehow. It doesn't have to be 65 spins around the sun specifically, or anti-vaxxers specifically, or the fact that we got hit early and other countries could put measures in place while they watched the US implode specifically, the USA has clearly done something wrong, and a CDC projection for the USA should not simply be factored up for the planet. That was a stupid move on my part. The only thing that keeps it in the "stupid move" pile and not the "criminally insane" pile, was that the projection I cited was from quite early on, and things were moving really fast and we had no idea how long it was going to last. The CDC wasn't even really exploring at the time a multiple-year outbreak. The number scales up, but that doesn't matter when the context does not.
Incidentally their models said 200,000 to 1.7 million and, gosh, that's quite a wide span and we're almost exactly in the center of it. Yay US!
By the way, did you know the life expectency is Niger is not even 65 years? That's legit horrifying. Maybe the reason their reported COVID deaths are so low is that everyone's dying of something else first. India it's 70, the US is nearly 80, Japan and Hong Kong lead the world north of 85. Japan's COVID death rate is also really low. And like 28% of Japan is over 65 right now. And their death count is like one-eigteenth ours, per capita. So whatever they're doing, whether it's one variable or several, it's clearly working.
You could also look at Sweden vs Finland. Finland is doing much better in proportional COVID deaths, no surprise they're Finland they're the best in the world at everything except maybe suntans and sobriety. But the two countries are back-to-back geographically and in life expectency (they're both about 83), yet Sweden's seen five times the proportionate kills, give or take a sauna. Now, I know just enough about both Sweden and Finland both before and during the pandemic to say there are significant impactful differences that could lead to those higher numbers. So could you, I bet, how Sweden's handled the pandemic isn't exactly hard news to find. Is it the hospitals? The culture of socialization? The, erm, questionable early stance that Sweden took? A mix? Probably that last one. And Sweden seems to be trying harder now, even if "harder" is a low bar to clear.