Young's second touchdown reception of the contest capped a 100-yard day in which he hauled down nine passes from Matthew Stafford (34-for-49, 352 yards, three touchdowns, one interception).
Stafford scored once on the ground while leading two late scoring drives for the Lions, who bounced back from last week's loss to the Chicago Bears and moved to 2-1 at home this season.
The Seahawks (4-4) dropped their second straight despite a pair of TD tosses from Russell Wilson (25-for-35, 236 yards, one interception).
Marshawn Lynch ran for 105 yards on 12 carries for Seattle.
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