I admire his tenacity a lot! He worked enormously hard to learn Master's level math properly. I hope I am half as switched on when I am his age.

P.S. One other thing I just remembered is he and my mum live in a country town 90km outside Melbourne. They weren't just round the corner from the university... It was a 90 minute trip by public transport each way. That's a major effort each day just to get to class if you are 18, let alone 75.