At the start of Season 5, Tea states how she, Joey and Tristian have been on Yugi's side towards everything they've faced for the past four years. So the show indicates a four year passing time between then and when the show started. So all the characters aged four years. Yugi was about 14-15 at the start of the show, so by Season 5 he's about 18-19 by the end of it.
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