Some people have lives, spouses, successful careers, children, maybe church commitments, or God forbid- other interests. Aikido is not a vocation for everyone who practices.
There are some, as myself, who do Aikido because it is pleasurable, interesting and it keeps me thinking. I would like nothing better than to train every day and commute to train with special teachers when they are around. My wife, kids, and job would not care for it however.
I just wanted to say that to hopefully give you a bit of perspective, Mr. Ledyard, not to criticize your view. In fact I agree with you.
I sympathize with this young man, and I have no profound advice, except the wise words Chuck has left. Look around while you are young, if possible train in Japan while you are young, take the time to find a great teacher, they exist.
When it is time to take on responsibilities, do that with commitment, and after retirement pursue your loves with abandon.