Richard Buckley put the home side ahead in 15 minutes, driving in a 10 yard shot after Richard Foster's cross was deflected into his path.
Foster saw red just before the interval after passing a comment to the referee but the young Dons simply pulled their sleeves up higher and battled harder to give themsleves the perfect lift before facing Celtic in the Cup final at Perth in a fortnight's time.
Far from being downhearted at the goal, the Dons roared back into the lead three minutes later when Kevin Souter netted with a spectacular long range shot.
Celtic battled right to the end and Craig Higgins produced heroics to head a net bound rocket shot off the line to emphasise it was Aberdeen's day.