I know there are some discussion about age computing, and some were in the past.
Now in the newest release, when there is only a christening event and no birth event it displays (aged 0 days). It looks odd.
Also when I have a date for christening, and a a birth event with a date "BEF date of christening" it displays (aged 0 days).
From my point of view there should no age dispayed in both cases.
The christenig was very often performed on the day of the birth - also in this case the text "aged 0 days" looks a litle bit strange. It would be better to have something like "on the day of the birth".