I am not sure about Silver Age but I know of a Golden Age Sg on Justice called the "All-Winners Society"
You might want to send a PM to @Killer Wail or @Pirhana I think one of them are the leader of that group.
Hope that helps.
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Thanks Chrome, I appreciate the help. It's not what I'm looking for these specific toons, but I'll have to keep that one in mind in case I make a golden ager. Much appreciated. 
Anyone else have some suggestions?
@Ninth Cloud
Justice
All-Winners Society started as a golden age theme group but we started including Silver age toon a few years back were not as active as we used to be but the core of the sg still plays and tries to get together once a week for JIVe (Justice, Infinty, Victory) since we have sg's on those 3 servers your welcome to send me a mess if you are interested @Killer Wail
Psykinetic lvl 50 Psy/kin Def
St. Pauli Girl lvl 30 Ice/emp Corr
Pthirus Pubis lvl 50 Crab
Killer Snail lvl 50 Ice/Dark Def
Lumberjax lvl 50 Stone/Axe Tank
@Killer Wail
Co-leader of All-Winners Society, Golden age sg
mem of Withered Hand, Avenging Flame, LoJ
I'm looking for an active (preferably well established) Silver Age style SG for two of my toons.
They are both mutant origin, if that matters to anyone. I'd love to RP with them, but if that's not possible then that's alright as well.
If your group has an application process, I am more than willing to fill one out. I'm just having a hard time finding an SG that fits what I'm looking for.
Thanks!
@Ninth Cloud
Justice