He was thirty-two. Not old — but he felt old. His body, whatever its mutant mental powers, was physically weak. Every star! Every star he could see —… - Isaac Asimov

I can't believe you. Are you under the impression that the Second Foundation is doing this for us? That they are some sort of idealists? Isn't it clear to you from your knowledge of politics — that they are doing it for themselves?
We are the cutting edge. We are the engine, the force. We labor and sweat and bleed and weep. They merely control — adjusting an amplifier here, closing a contact there, and doing it all with ease and without risk to themselves. Then, when it is all done and when, after a thousand years of heaving and straining, we have set up the Second Galactic Empire, the people of the Second Foundation will move in as the ruling elite.

Very few people are aware of the fact that in the beginning the proud and glorious phrase "dirty old man" was actually meant as derision.
The very phrase, originated as it was by young men, is a standing testimonial to the ignorance of the same young men. Sex is dirty — if you do it right. Young men don't know how to do it right, so they stay clean. Some old men never learn how and they stay clean, too.
But unless you have the ambition to retreat into dull hopelessness, don't you do it. Don't be bashful with ladies while young and retreat altogether as you grow older. Grow bolder with the years: advance, advance.
Be a dirty old man and be proud of it.

— La división entre humano y robot no es quizá tan significativa como la división entre inteligencia y falta de ella