Analysis of information sources in references of the Wikipedia article "Sergey Avdeev" in English language version.
Avdeyev is 00.2 seconds younger than he would have been had he never traveled in space.
Spending just over two years in Mir's Earth orbit, going 17,500 miles per hour, put Sergei Avdeyev 1/50th of a second into the futureā¦'he's the greatest time traveler we have so far.'
'The greatest time traveler so far is (cosmonaut) Sergei Avdeyev, who, by virtue of being on space flights for 748 days, is one-fiftieth of a second younger than if he had stayed home. So that man has traveled one-fiftieth of a second into the future.'
Avdeyev is 00.2 seconds younger than he would have been had he never traveled in space.