Maths understander here, in 2042 they'll be 60, not 62. Also the average life expectancy in the US is around 77-78 years, i.e. enough of a difference compared to 60 that you could more or less fit (and live to see) a grandkid/great-grandkid's entire childhood in there.

Although that 79 years figure is Life Expectancy at Birth, in practice it tends to be longer for most surviving adults older than a certain point, mostly because the lower ranges of the chart hit their allotted moment and pass on for whatever reason, leaving the remaining average higher still

~~Of course, with calculus living rent free in my head rn thanks to the uni course of the same name, I'm wondering what that chart of "current age vs expected remaining age" looks like, and where the point of "ageing faster than your remaining likely time grows" lies~~

Edit: source turned out to be a little out of date (although they always tend to bicker a little on the exact number), corrected for it