My father did a Masters of Mechanical Engineering at age 70, as a full time degree. The only affordance to his age was being given an extra hour in the exams.

Following that, he started a Masters of Aeronautical Engineering. Until my mum suggested he spends more time with her at home.

Now he does gym circuit training with a group half his age, at 6am three mornings a week.

Hope I have that energy when I am his age...