#4 The Undertaker
The Undertaker is one of the most famous wrestlers to ever step into the WWE. He has been working in the company since 1984 and still wrestles for at least one match per year. He is best remembered for his WrestleMania Streak and his legendary move set.
Undertaker is currently 53 years old, and wrestling at this age is not easy at all. However, his body cannot be risked anymore, as any injuries at this age can be fatal. Back in his time, he has been a great all-round performer. He is considered one of the best pure strikers in the WWE and is one of the most respected superstars in the company.
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Every year there are rumors of his retirement, but it never happened till now. It's probable that he won't wrestle for more than two years now.
This is the best time for his retirement, as he has sacrificed his whole life to maintain his in-ring gimmick. Now, he must aim to enjoy his life, leaving his wrestling career behind.