It won't be one of his opponents, but rather Father Time and Undertaker himself who will end his WrestleMania undefeated streak.
The Deadman's streak could stretch past his 50th birthday if he so chooses.
Defeating CM Punk extended his run of invincibility to 21-0. It's plausible that Undertaker, now 48 years old, could extend that to 22-0 at WrestleMania XXX. How much longer after that does he have in him?
Undertaker's shoulder and hips are among his biggest roadblocks to the streak continuing. As reported by Wrestling Observer Newsletter (via WrestlingInc.com) "Taker's left shoulder was in bad shape" after his WrestleMania 28 match with Triple H. Surgeries and long-term punishment have taken their toll on him.
If, however, he sticks to his current schedule of wrestling only at WrestleMania, he should extend his career and his streak for a number of additional years.
After a single night of abuse, spills, slams and strikes, Undertaker can essentially hibernate for a year. All but the most debilitating injures can heal in that span.
Despite the condition of his body now, he has managed to make the most of his annual appearances. His match with CM Punk not only extended his undefeated streak at WrestleMania, but also his stretch of classics at the event.
He has become like a power hitter who only returns for a single game at the World Series and hits a pair of homers each time out.
That amount of rest between matches must help him refuel emotionally as well. Undertaker doesn't have to suffer the tortuous travel schedule that the full-timers do. He has the entire year to recharge, to gather all the adrenaline and motivation required to perform at a high level.
If he isn't drained by then or if his body isn't completely broken down, Undertaker could conceivably make it to 25-0. That's a long shot of course, as he would be 52 years old at that point. He wouldn't be nearly as good in the ring as he was at his best, but there would undoubtedly be demand for a 25th WrestleMania match from him.
It's more likely, though, that Undertaker will call it quits before then.
As legendary of a figure as he is with WWE, what else can he really accomplish? There is no doubt about his Hall of Fame qualifications. There is no doubt about his status as an all-time great.
Continuing the streak past WrestleMania 30 only happens if Undertaker continues to find motivation to return and if WWE can find him worthy challengers.
Brock Lesnar vs. Undertaker would be an intriguing WrestleMania battle. Beyond that, where does WWE go to find foes? Is John Cena or The Rock an option for a future WrestleMania?
Undertaker can extend this journey until his legs grow weary.
The Deadman will choose where his horizon lies, if his unparalleled WrestleMania run ends with one more victory or if that victory count will approach the quarter-century mark.