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As many of you probably don't know, I haven't been the biggest fan of the human race's development. There's actually nothing wrong with it save for the time period, which asserts that humanity reverse-engineered interstellar drives in the 1970's.
However, I've started a retcon of this which asserts that the calendar used by most races is not the Gregorian calendar most people use. So while the interstellar drive was invented by humans in the 1970's, it's the 1970's of the Standard calendar used by most races, not the Gregorian calendar. In that calendar, the current year is 2092 AD.
Also, the ships humanity found aren't fairy ships. I haven't yet figured out who left them there yet, but so far I'm leaning towards the Siranians, as they've been known to have visited Earth a lot early in human history.
For more about this change, visit this blog post of mine.