Ticking away
The moments that make up a dull day
You fritter and waste the hours
In an offhand way
Kicking around on a piece of ground
In your hometown
Waiting for someone
Or something to show you the way
Tired of lying in the sunshine
Staying home to watch the rain
You are young and life is long
And there is time to kill today
And then one day you find
Ten years have got behind you
No one told you when to run
You missed the starting gun
Yes, exactly my point. The boomer generation itself made the population pyramid look different at every stage of its life, which is why the 1980 chart looks so different from the 2023 chart. When you introduce a cohort that has its own slope from birth statistics, the shape of the drop off at 60 is confounded by the preexisting shape of the slope before they entered old age.
So the appropriate method of isolating the variable that shows what you call a "die off" would be to just pull up the actuarial tables that show what percentage of 60, 61, 62 year olds, etc., die that year. Not to compare how many of those there are as a percent of overall population.
Except they cover the period we're worried about. Everyone figures anything after 80 is a gift. The oldest boomers are 78. You have 2 years on that chart that might be questionable. Seeing the die off start at 65 to 75 is all within the "new" paradigm.
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%.