Shambu Tamang
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Shambu Tamang (born circa 1955), a Sherpa from Nepal, was the youngest person on record to successfully ascend Mount Everest, reaching the summit on May 5, 1973. Records differ on his actual age at the time of the successful climb; although most records claim he was 16 years of age, it is currently believed he was actually 18 years old.
After his first successful climb of the mountain, he returned 12 years later and climbed it a second time, summitting on December 28, 1985.