QoL: Birth date of a toon
I thought that your idea was going to be to have the info at the login screen, but via NPC works fine for me.
Vet Badges tell how old the account is, except for period of inactivity.
Anniversary badges are a very rough gauge, and only show if that particular character logged in that month. I very much wish they were account-wide.
Overall, I see a little (but not much) use from this. I would use it for a few characters occasionally.
I see no real downside to this, other than the (hopefully short) amount of programmer time needed, as it only shows to the player, and not to all.
I vote yes.
I'd prefer it on the login screen and an NPC, but only the NPC would be acceptable.
I support this suggestion assuming the data has been tracked.

@Catwhoorg "Rule of Three - Finale" Arc# 1984
@Mr Falkland Islands"A Nation Goes Rogue" Arc# 2369 "Toasters and Pop Tarts" Arc#116617
I fully support this idea, if as Cat said, if the data has been tracked.
I generally put a new alt in the SG/VG within a day or so of creating them, but not always. So even that metric isn't a surefire way. As it stands, I only know the birthdate of Shadow for sure. It would be nice to know exactly when certain alts were started.
Now, whether it's clicking on an NPC, at the Login Screen, or even say a command such as "/dob", I think it will be an awesome QoL addition.
It's a small thing really, but every once in a while I forget how long ago I made my characters. I make a lot of toons and have probably delete d more than I currently have. While I can find the NPCs with the right initial to find out how many hours I've played my toon, or how many times I've played them, sometimes I just want to know how old they really are.
Now to clarify, I'm saying that this would only be for my own toons. Only I can see the birth date of my toons, and only you can see the birth date of your toons. Honestly, I don't want to know how old yours are, because then I'd be curious and might find your level 50 was created two weeks ago, and might judge you as a PLer, and then decide you're not someone I want to team with. I'm sure others would feel the same way, and I don't want there to be any broadcasts by random people "Hey Johnny Snow here is a PLer, don't play with him cause he doesn't know how to play his build" especially when Johnny Snow didn't even know he was being looked at that way.
How would I like this to be done? Same as the other things I mentioned above. Finding an NPC citizen with the right type of initial. Lets say "T". So I see a citizen walking down the sidewalk and his name is "Thomas". I click on him, and he says "Hey Johnny Snow, you first started your career in Paragon City/Rogue Isles on 6/23/08"
Now I know what you might be thinking. We've got the anniversary badges to do this for us. But, that's not completely accurate. Say I missed a year, or that I started playing CoH/V just after that badge was given out. I could still get it every year after, but I still don't know just how old that toon really is unless I kept really good track. Frankly, I don't.
As to why this is needed? It's not really. It's just a little bonus info like knowing how many hours you've played a certain toon. Like if I hit level 50, and I want to know how long it took me, I can find out the hours played, but not the length of time from birth to 50 in terms of days/weeks/months/years.
Thoughts?