That population pyramid is a bit misleading because the baby boom coincides with the ages with the steepest declines. In part, there were significantly fewer people born in 1939 compared to 1959, so you’d expect way more 65 year olds than 85 year olds in 2024.
Yes, the death rate is higher among older people, but the life expectancy of a 60 year old man is still another 20 years.
You don’t think that 1980 chart has a very different shape? The current chart is almost flat from 20-60, while the 1980 chart is actually pyramid shaped, with the steepness is only slightly sharper past 60. And matches the steepness of the range from 25-50. Nobody talks about a 25-year-old die off.
You’re better off charting the actuarial tables to convey the data you’re trying to talk about (death rates), rather than relying on a stat that is influenced by birth rates and death rates in an opaque way.