Similar quotesThe man who views the world at 50 the same as he did at 20 has wasted 30 years of his life.
Muhammad Ali 
Remember when life's path is steep to keep your mind even.
Horace 
Great minds discuss ideas. Average minds discuss events. Small minds discuss people.
Eleanor Roosevelt 
Of all the things I've lost, I miss my mind the most.
Mark Twain 
In youth we learn; in age we understand.
Marie von Ebner-Eschenbach 