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*Club domestic league appearances and goals, correct as of 18:47, 01 March 2009 (EST) ‡ National team caps and goals, correct as of 17:06, 28 March 2009 (EST)
Agüero was born in Quilmes, Buenos Aires on 2 June 1988 into a large family with seven children. Agüero started playing football at a young age and he often played on a pitch in his local neighbourhood Villa Itali.
On 19 February 2009, it was announced that Agüero's fiancée, Giannina Maradona, the younger daughter of Argentine football legend Diego Maradona, had given birth to a son named Benjamin in Madrid. Maradona was in the Spanish capital for the birth of his first grandson, while Agüero, 20, missed Atlético's training session earlier in the day. Atlético offered their congratulations in a statement on their official website.
Agüero has a tattoo on the inside of his right arm, inscribed in Tengwar (a form of writing invented by J.R.R. Tolkien and used by the Elves in his works). It translates roughly to "Kun Aguero" in the Latin alphabet.