In my day at 12 years old which was 38 years ago we worked out in summer months for two and a half hours. Today someone in that age group might work out for four hours two hours in the morning and two at night.
You can't be as old as I am without waking up with a surprised look on your face every morning: 'Holy Christ whaddya know - I'm still around!' It's absolutely amazing that I survived all the booze and smoking and the cars and the career.