| A dear friend of mine who turned 75 years old this year does 100 squats everyday (about 6 months before ski season opens) to prepare his legs for the skiing season. While squating, he also does biceps and triceps exercises with 3-4 kg dumbbell in each hand. He's been doing this routine for decades. I've never heard him complain about his knees. When I told him to try other "newer" leg conditioning exercises to prepare him for skiing, he says, in a very patient voice, that he sees no reason to change something that has worked wonderfully for him for decades.
To those who assumes that he is a slow skier, he loves black/diamond runs and moguls, and can outski people 30 or 40 years his junior. | 
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