The value of old age depends upon the person who reaches it. To some men of early performance it is useless. To others, who are late to develop, it just enables them to finish the job.
What do you do after you are world-famous and nineteen or twenty and you have sat with prime ministers, kings and queens, the Pope? Do you go back home and take a job? What do you do to keep your sanity? You come back to the real world.