The average person puts only 25% of his energy and ability into his work. The world takes off its hat to those who put in more than 50% of their capacity and stands on its head for those few and far between souls who devote 100%.
Wrinkles should merely indicate where smiles have been.
Anyone who stops learning is old whether at twenty or eighty. Anyone who...
Age is an issue of mind over matter. If you don't mind it doesn't matter.