Character ages is fine but I realized a few days ago that I've been playing as Imbros for ten years this year and that's way more interesting.So in no particular order of the characters I'm still actively playing:
I started playing as the Alcohol Demon 12 years ago.
Imbros my table top mindflayer character 10 years ago.
Kuai Liang (Sub-Zero) 6 years ago.
Angelo Genna 3 years ago.
Blas Cap has been 9 years
Kabal also 6 years ago.
Variks 7 years ago.
Imbros my table top mindflayer character 10 years ago.
Kuai Liang (Sub-Zero) 6 years ago.
Angelo Genna 3 years ago.
Blas Cap has been 9 years
Kabal also 6 years ago.
Variks 7 years ago.
my newest is Yufei which was a year in January.
Maximilien for 4 years
Deputy Pratt for 7 years.
Maximilien for 4 years
Deputy Pratt for 7 years.
... I can't believe my longest running character is the Alcohol Demon.
tho if i still played Sniper that would be 13 years. 
my oldest (and first) would be Dr. Linda Friitawa from DC comics which was in 2009 so 15 years ago...
as an asise if anyone knows this Tav they are delightful and I adore them: https://bakerstreet.drea...
10 years of Imbros and this is the closest he's gotten to an existential crisis.