Nikola Tesla (1856-1943), Died age 87
Eccentric and brilliant Serbian-American inventor of electrical devices (among them the AC generators that power most of the world, wireless transfer of infromation etc. Thomas Edison's work looks very insignificant compared with Tesla's work).
Tesla was less successful at having a personal life. He shunned physical contact of any type, going so far as to feign hand injuries to avoid shaking hands with people he just met. One female acquaintance who grew enamored of Tesla reportedly took the initiative and tried to kiss him, causing the reticent inventor to recoil in terror. In all likelihood he died celibate at age 87.
Sir Isaac Newton (1642-1727), Died age 85
Newt, it seems, was such a prude that he didn’t get into any relationship until he was middle-aged, and most historians believe it went unconsummated. It’s also unlikely that he availed himself of, ah, commercial outlets.
Paul Erdos (1913-1996), Died age 83
Single throughout his life, Paul preferred to live a monkish, nomadic life devoted to his studies in mathematics (he published over 1,475 academic papers during his lifetime). Of his celibacy he made no secret, telling reporters that as a child he "could not stand physical pleasure."