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I don’t disagree, but people get confused by average lifespan because it includes babies that die. If you live to 60, in the USA you’re expected to live another 21.4 years (almost 82). https://www.census.gov/library/stories/2021/05/long-life-does-not-always-mean-a-healthy-life-in-old-age.html
And that number is still an average. But I get it, 50 still isn’t the middle.
People don't understand what life expectancy means, specifically because 99% of the time, people are talking about life expectancy at birth. What life expectancy st birth means is that half the babies are going to be dead before X years (in the case of OP picture that mean half are going to die before reaching 73 yo), so yeah, the majority of people is going to be 50 yo at some point of their life.
https://www.ssa.gov/oact/STATS/table4c6.html
And interestingly 38-39 is when your expected remaining is your age.