Seems to be based on this paper: https://papers.ssrn.com/sol3/papers.cfm?abstract_id=3089523
There appears to also be presentation slides for a preview of this paper at: https://siepr.stanford.edu/system/files/FITZPATRICK_Age62mor.... Apparently, the effect is not that large; ~2% jump in mortality rates for males and ~1% for females.