How old was Johnny Clem when he entered the US Army in 1863?

Johnny Clem was born on August 13, 1851 in Newark, Ohio. At the age of 10, with the start of the American Civil War, Johnny tried to join the Union Army. Although he immediately dropped out of school and did numerous exercises with the 3rd Ohio Volunteer Regiment, he was initially turned down every time the recruiters were in town because of his age. Some sources point out that he was eventually accepted into the 24th Ohio Volunteer Infantry, other sources suggest that it was initially the 22nd Michigan. Since he was still officially denied entry into the service, he was initially paid a bonus directly by the officers. The other soldiers gave him a rifle and a uniform and trained him as a drummer. In May 1863 he was finally allowed to officially enroll in the Union Army (he received a full 12 dollars for a month). At that point, he was only 12 years old, despite everything. In the meantime, however, Johnny had already taken part in numerous skirmishes and achieved a certain fame .

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Here is a better link.

https://en.wikipedia.org/wiki/John_Clem