This isn't a "should they age" thread, or a "what fits in their continuity" thread. When you look at the characters in the titles you read (or remember), without doing any math, how old do you figure that they are?

For me:

Superman's about 30-35.

Batman's about 35.

Nightwing is about 25 or 26

Batgirl is about 28 or 29

Robin is about 14

Wonder Woman: there's no telling because she's immortal, but she physically looks under 30

Wonder Girl is about 15

Flash (Barry) is about 30

Flash (Wally) I'm not sure anymore, but he's about Nightwing's age

Green Lantern (Jordan) is somewhere between 28-32

Green Lantern (Stewart) is about 35-40

Green Arrow is about 30

Speedy/Arsenal/Red Arrow/Whatever is about 26

Martian Manhunter: there's no telling

Black Canary is between 28-30

Hawkman and Hawkwoman are both (relatively) about 35

Black Lightning is about 32