The cardinal number immediately following sixty-two and preceding sixty-four. (noun)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "sixty-three" in a sentence
"While participating in a militia muster, he supplied an entire hogshead—sixty-three gallons—of rum punch, which “entertained all the people and made them drunk and fighting all the evening, but without mischief.”"
"At sixty-three and about six feet tall, he looked fit and comfortable, particularly for someone facing the possibility of spending the rest of his life in prison."
"Dinwiddie was wearing down at age sixty-three, and he talked about retiring and going home."