You keep calling it a “die off” because you’re being visually tricked by the misleading population pyramid. Use the actuarial tables instead.
Among 65 year old men, the probability of surviving to 75 is 76%. The probability of surviving to 85 is 39%. The probability of surviving to 95 is 5.9%.
For women, the odds are 84%, 52%, and 12% of getting to 75/85/95, respectively.
Yes, these are higher death rates than at younger ages. But nowhere near what the shape of the population pyramid suggests, where the 85 age cohort is about 1/4 as large as the 65, which misleadingly suggests a probability of 25% of living 20 more years, when the real number is closer to 45%.
This is the opposite side of the “wowthanksimcured” hashtag/subreddit/topic that was popular about 10 years ago. These feelings don’t always have an objectively rational cause. Which also means that if there’s some kind of medical cause or intervention necessary, screening for it is important.