I don't know his real age... it's an estimation as you asked and as i've said a hundred times the knowledge from what work colleagues have told me.
Like Yakubu, Mikel, Kanu and Martins.. and even celestine babayaro has come and and said martins was really 28 when he joined newcastle. Martins was at Inter when he was "17" to the age of "20".. really he was older then that.