User blog comment:Archivist217/Expansion of Young Justice, if the series renews/@comment-99.230.16.127-20121202135045/@comment-4928331-20121205075239

Four things:
 * 1) As of Team Year Six, Nightwing is 19, and Robin is 14.  Jason, were he still alive, would be somewhere in between.  (The average is about 16.5).
 * 2) Although clearly well-trained (you see him move in sync with Batgirl, and his fighting style is more brutal than Robin Dick), Tim's not that experienced.  He lacks self-confidence, as we saw in Season 2 episode 1.
 * 3) Stands to reason that Tim has been doing the Robin schtick for 1 year tops.  Since Jason would be 16.5, that places his death at 14.5-15.5, assuming Batman spent no time in getting a new Robin.
 * 4) Jason Todd's origin is traditionally someone who tried to steal the hubcaps from the Batmobile.  He lives on the street, and would naturally be less well-nourished than the average teenager.  It is entirely possible for that hologram to be a 15.5 year old boy.