Just in by sat phone from Everest high camp:
Dan Lochner and Dan Meggitt just summited Everest along with Ang Migma Sherpa and Mingma Dorje Sherpa from the North side.
Dan Lochner, who turned 22 on May 12th (happy birthday!), needs only Vinson to become the youngest person to make the seven summits. But he's got to be quick and go for Vinson this year. On the South side is Britton Keeshan, 22 and a half years old, and if he gets Everest he will be the youngest to complete the seven.
The current record for the youngest 7 summiter belongs to Japanese climber Atsushi Yamada, who completed the feat at 23 years, 9 days.
Dan Lochner and Britton Keeshan, climbing Everest from the North and South respectively, are in line to become the youngest to climb the seven summits. Britton Keeshan, the grandson of Bob Keeshan, a.k.a. Captain Kangaroo, is 22 years old and is climbing with Alpine Ascents on the South side.
Dan turned 22 May 12th. Vinson, his last mountain after Everest, is typically summited in November through January. He could potentially be 22 years and 6 months at the completion of his 7 summits.
(from this page