Scottie Scheffler has admitted he is astonished by the remarkable longevity of Rory McIlroy as the two superstars prepare to renew their rivalry at this week's PGA Championship.The world's top two players, who have shared four of the last five major titles between them, are among the leading contenders heading into the 108th edition of the tournament at Aronimink Golf Club in Pennsylvania.Scheffler, who claimed last year's PGA Championship and Open Championship titles, was full of admiration when discussing what makes McIlroy such a formidable competitor.The American hailed the Northern Irishman's driving ability as the finest he has ever witnessed.TRENDINGStoriesVideosYour Say"When you look at just his game, his ability to drive the ball is the best I've seen, not only with his speed but how accurate he is as well," Scheffler said, per Flashscore."He's able to take out certain things on some golf courses that not many players can do. He does it in a way where he hits a lot of fairways as well."Yet it is McIlroy's extraordinary staying power at the summit of world golf that Scheffler finds most impressive.McIlroy won his first major title at the 2011 US Open, and 15 years later remains firmly among the sport's elite after capturing back-to-back Masters titles and a sixth major crown last month.Scheffler admitted maintaining such a high standard over such an extended period is something few players can truly appreciate."Another thing is his longevity. Hard to have an understanding of what it takes to remain at the top for as long as he has," Scheffler explained.LATEST SPORTS NEWS:Football facing major rule change after West Ham and Arsenal VAR fiascoTravis Kelce and Taylor Swift devise extraordinary two-wedding planRory McIlroy gives PGA Championship update after major injury scare"Rory is one of those guys that checks the box each week. He's a guy I always see in the gym, the practice facility."When you look at when he won his first major championship to now it has been 15 years."That's pretty difficult to do, so for him to still be at the top of the game for this long is quite impressive."McIlroy, in turn, highlighted Scheffler's extraordinary consistency and mental resilience as the key ingredients behind his dominance since breaking through in 2022."He has played consistently excellent golf ever since he got his first win back at the start of 2022, and he hasn't really dropped off since then," McIlroy said."You look at his game and you don't see a weakness, from a physical standpoint, from a mental standpoint."The 36-year-old also praised Scheffler's ability to quickly move on from disappointment."He seems like he has a good mindset of last week's done, I'll move on to this week," McIlroy added."He operates in the present so well, and that's one of his super strengths."Our Standards: The GB News Editorial Charter