Some mathematicians believe that mathematics is a mind game, therefore like any other game, young persons engage in them more fully. However, youth is not a time of life -- it is a state of mind. Therefore, as long as your mind is active, you are young and indeed well-suited for the excitement of OR/MS profession. No one is too old if they have a passion to learn. To absorb new ideas is to live anew to see the world with fresh eyes. Henry Ford said "Anyone who stops learning is old, whether at twenty or eighty. Anyone who keeps learning stays young. The greatest thing in life is to keep your mind young."