The Thunder pretty easily took care of business in Game 1 of the conference semifinals playoff series vs. the Lakers on Tuesday night, winning 108–90 . This series marks the first time these two teams have met since 2012, meaning it’s the first playoff matchup against legend LeBron James for a good chunk of the young Oklahoma City roster, including Chet Holmgren. The reigning NBA champions hope to beat the four-time champion to advance to the conference finals. Playing against James in the postseason is something Holmgren admitted he never really thought of being a possibility solely because of age. The 41-year-old is in his record 23rd NBA season—no one really knew how long James would be competing for. At 24, this is Holmgren’s fourth year in the league, putting a big age gap between the two players. Mannix: Three Thoughts on Thunder’s Defensive Masterpiece vs.…