"If you view life at 50 the same as you did at 20 - you have wasted 30 years lf your life."

I think it's actually one good thing that he's actually said. If you've keep the same routine throughout those 20 years, what's memorable? what has changed? Nothing. He's saying you've wasted it, by not having a different perspective or change a view towards it. Not even doing the simplest action that could've caused change. Think about it by 50, don't you think you've grown wiser or anything?