In reading about the Italian singer Francesco Di Giacomo, I found that the English Wikipedia lists his life as "(22 August 1947 – 21 February 2014)" and claims, logically enough, that he died aged 66.
However, the article cited claims that he died aged 67. I don't speak Italian, but as far as I can tell "67 anni" is pretty unambiguous.
The Italian Wikipedia lists an age of 66 and cites two articles. The only one of those with an age is this one (published in February 2014), which lists his date of birth as "22 agosto 1947", but goes on to say that he was aged 67, seemingly contradicting itself.
Are all of these publications mistaken, or is there a cultural difference here that I have been unable to discover by searching in English - for instance, age being counted by the number of calendar years since birth, rather than actual years? I find it especially hard to believe that the last article could list his date of birth and then give an incorrect age in the next sentence.