Only if a character's age is important to the plot and can be reliably sourced. Again, see Lola Pearce for an example. There's another article I used as an example once where it says "the character is aged 19 upon her arrival", with a reliable source, but I can't remember which one is was. Michael Moon's age probably isn't important, for example. We know he's an adult, and there's a photo so we can kind of guess how old he is. –projectors–