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In page Mark Spitz:

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At 10, Spitz held one world age-group record and 17 national records.[6] When Spitz was 14, his family moved to Santa Clara, where he joined the Santa Clara Swim Club and was trained by coach George F. Haines.[6] From 1964 to 1968, Spitz trained with Haines at SCSC and Santa Clara High School. During his four years there, Spitz held national high school records in every stroke and in every distance.[citation needed] In 1966 at age 16, he won the 100-meter butterfly at the AAU national championships, the first of his 24 total AAU titles. The following year, Spitz emerged on the world swimming stage when he set his first world record at a small California meet with a time of 4:10.60 in the 400-meter freestyle.[7]