Can anyone with a background in the area comment on how legit this is? I have no trouble believing that a spry research professor in a quantitative field could

Can anyone with a background in the area comment on how legit this is? I have no trouble believing that a spry research professor in a quantitative field could get a PhD in another quantitative field at a fairly advanced age, especially if they can bring existing skills that are underused in their new domain, but it would be genuinely amazing if someone in his 80ies were to successfully > set to work on a very difficult problem [...] the theory that he was doing involves techniques that are incredibly advanced and challenging to master in physics, a field were people are often considered over the hill past their 20ies, and an elite uni at that. The only reference to his work a quick google scholar search turned up is from 2012: https://meetings.aps.org/Meeting/MAR12/Session/Z26.1 https://meetings.aps.org/Meeting/MAR12/Session/Z26.1