Young, a 6-foot-8 senior who started the first 14 games of the season, gave the Cyclones (9-9, 2-4 Big 12) a much-needed energy boost and also grabbed nine rebounds as the Cowboys (9-9, 0-6) remained winless in conference play.
Lindy Waters led Oklahoma State with 14 points and Cameron McGriff had nine rebounds.
Iowa State appeared to be on the verge of breaking the game open early after building a 30-19 lead with 4:58 left in the first half, but the Cowboys responded with a 13-1 run and trailed 37-35 at halftime.
The Cyclones, who made of 11 of 24 3-point attempts, led 75-60 with five minutes left and held off a late Cowboys' charge by hitting four straight free throws in the closing moments.
Oklahoma State: The Cowboys committed a season-low eight turnovers, but were ourebounded 39-30 and allowed Iowa State to shoot 51% from the field. Oklahoma State's struggles at Hilton Coliseum continued as it dropped its eighth consecutive game there. Four of those setbacks have come by four points or fewer.
Iowa State: The Cyclones avoided joining the Cowboys in the Big 12 basement by winning their second straight home game. Iowa State needed a boost after double-digit road losses at No. 1 Baylor and No. 18 Texas Tech. The Cyclones made just 3 of 22 from 3-point range in the loss to the Red Raiders, but drilled 46% of their 3s on Tuesday.
UP NEXT (20)
Oklahoma State: Plays at Texas A&M on Saturday.
Iowa State: Plays at No. 16 Auburn on Saturday.