Actually, Randy Orton's record is ONLY really a WWE record, not a record in professional wrestling, because "The Big Show" Paul Wight or "The Giant, as he was called at that time in WCW, won the then-very-prestigious WCW World Heavyweight Title at the young age of 23 at Halloween Havoc 1995. He is also the 3rd youngest superstar to ever win the WWE Title at the age of 27 in at ARMAGEDDON 1999. He is now 41 years old and still with the WWE, despite a weight problem in 2000-2001, a 14-month absence, funny but butchering various comedy segments, and a lackluster World Heavyweight Championship reign.
Did The Giant (Big Show) suffer from the same problem that Orton suffered from after winning the straps so young in either WCW or WWF/E with no clear sense of direction after they drop the belt? It's hard to say. Orton is 33 years old right now and still with the WWE, 9 years after he originally won the strap, despite 2 wellness violations, a suspension for getting caught backstage smoking marijuana w/ Chris Masters, a couple of injuries, backstage heat, practically destroying a hotel room once, and pointless various feuds. I would think that if a wrestler won a world title at a very young age and goes on to stay in the company for a very long time after, then it's more of an investment.
Both Orton and Big Show have had longer pro wrestling careers than both Dwayne "The Rock" Johnson and Brock Lesnar, combined. Established young guys do not always have to be chasing the title, look at Orton's 2005 feud with The Undertaker or Big Show's countless non-title feuds. A wrestler may win a world title at the age of 22 and then stay in wrestling until they're well into their 40's. As far as Orton's record being "officially broken" in WWE, it's hard to say. Very few real young wrestlers are really being groomed for the future. Look at the major pushes of the last ten years, Batista, Sheamus, Alberto Del Rio, CM Punk, Daniel Bryan, Austin Aries, Bobby Roode, JBL, Rey Mysterio, Jeff Hardy, and countless others. (Yes, I count TNA guys in this.)
What do they ALL have in common? They were all at least 30 years old when they won their 1st world championships. Rene Dupree is the youngest person to ever hold a WWE championship of any kind, winning the WWE tag team titles in 2003. He went to stay with the WWE for a # of years before being released, so you never know.
There's be a better chance of someone winning the TNA World Heavyweight Title young than Orton than the WWE/WH.