Nobody grows old by merely living a number of years. People grow old by deserting their ideals.
You are as young as your faith, as old as your doubt, as young as your self-confidence, as old as your fear, as young as your hope, as old as your despair.
In a central place of every heart there is a recording chamber; so long as it receives of beauty, hope, cheer and courage, so long are you young. When the wires are all down and your heart is covered with he snows of pessimism and the ice of cynicism, then, and only then, are you grown old.
- Douglas MacArthur, on his 75th birthday
It's physically located in Watertown, Massachusetts, but that's never stopped it from having a good time.