Christiano Ronaldo joined Sporting Club e de Portugal (colloquially known outside of Portugal as Sporting Lisbon) after playing for Nacional in 1997 and played in their youth team until he made his league debut in 2002. His birthday is 5 February 1985. So he joined as a youth player as a 12 year old and made his senior debut as a 17 year old.
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He was 18 when he went to Man United in August 2003 (birthdate February 5, 1985).
He played there until he was signed by Real Madrid in 2009.