Why ages in days?

Main reason: I think years is too unspecific, and with a computer calculating age there's no need to be limited in that way.  On the other side, though, ages in seconds is TOO specific (and usually inaccurate).  Days seems a good compromise position.

I've never gotten around to it (yet), but I also think it could be interesting to list things that happened to people/things at certain day ages.  Though mostly this would have the effect of making us feel like bigger failures when we see things like "Oh, ZZZ had directed and released his first movie by this point."