Let's take Standard speed for example. Is the tech advancement in Civ5 match with the real world? This is saying without GS bulbing and no research agreements and no science specialists and no science nations like Babylon and Korea.
REAL eras timeline for Western European perspective from wikipedia.
Ancient: 3000BC to 800BC
Classical: 700BC to 400AD
Medieval: 500AD to 1500AD
Renaissance: 1500AD to 1700AD
Industrial: 1800AD to 1900AD
Modern, Future: 1900AD to whenever
REAL eras timeline for Western European perspective from wikipedia.
Ancient: 3000BC to 800BC
Classical: 700BC to 400AD
Medieval: 500AD to 1500AD
Renaissance: 1500AD to 1700AD
Industrial: 1800AD to 1900AD
Modern, Future: 1900AD to whenever