Taken from DC Cosmic Teams :


Colossal Boy......19 years, 0 months
Phantom Girl......18 years, 1 months
Ultra Boy.........17 years, 10 months
Laurel Gand.......17 years, 3 months
Element Lad.......17 years, 3 month
Chameleon Boy.....17 years, 2 months
Sun Boy...........17 years, 2 months
Saturn Girl.......16 years, 8 months
Shrinking Violet..15 years, 10 months
Lightning Lass....15 years, 6 months
Brainiac 5........15 years, 3 months
Cosmic Boy........15 years, 1 month
Dream Girl........13 years, 6 months
Lightning Lad.....13 years, 5 months
Timber Wolf.......13 years, 4 months
Valor.............13 years, 0 months
Star Boy..........11 years, 8 months
Projectra.........11 years, 3 months
Wildfire..........10 years, 4 months
Dawnstar..........10 years, 2 month
Shadow Lass........9 years, 5 months
Invisible Kid II...8 years, 8 months
Duo Damsel.........8 years, 3 months
Invisible Kid I....8 years, 0 months
Blok...............7 years, 11 months
Matter-Eater Lad...7 years, 5 months
Polar Boy..........6 years, 7 months
Karate Kid.........6 years, 1 month
Tellus.............5 years, 7 months
White Witch........4 years, 9 months
Bouncing Boy.......4 years, 6 months
Magnetic Kid II....3 years, 5 months
Chemical King......3 years, 0 months
Quislet............2 years, 11 months
Impulse............2 years, 4 months
Tyroc..............1 year, 11 months
Kid Quantum........1 year, 0 months
Kono...............0 years, 9 months
Celeste Rockfish...0 years, 9 months
Infectious Lass....0 years, 6 months
Ferro Lad..........0 years, 5 months
Spider Girl........0 years, 1 month
Devlin O'Ryan......0 years, 1 month
Blood Claw.........0 years, 1 month
Firefist...........0 years, 1 month
Flederweb..........0 years, 1 month
Veilmist...........0 years, 1 month