An inspiration to us all.
After reading his profile online, he passed Gr. 7 years ago and had a time gap. If you get a total beginner to start piano at 60, it's more difficult to get to Gr. 8. The first thing would be to convince a senior with no experience playing an instrument he can learn piano and he has enough years left to do it. Someone like myself who already play at a Gr. 3 level, picking up piano again after a long break would be much easier.
A lot depends on the individual. When my father retired, he tried to learn the accordion that he hadn't touched for years. Playing at the beginner level, he gave up after a month. At the time he may be showing early signs of dementia. Older people tend to have medical issues that would prevent them from getting into some activities that require physical strength or dexterity. Arthritis or joint pain can keep someone away from playing an instrument.
Sometime ago there was a TV documentary about the New Horizons Music started in the US. It's a music program designed for adults with little or no experience playing an instrument. Many of the people are already 50+
https://newhorizonsmusic.org/Concept_and_Philosophy