Definition of anachronism:
(n) :
a chronological mistake; the erroneous dating of an event, circumstance etc; a person or thing which seems to belong to a different
time
"1956: His movements, his clothes, everything about him, seemed slightly out of place in this assembly. He spoiled the pattern; like Alvin, he was an anachronism. -- Arthur C. Clarke, The City and the Stars, p 32"