Anonymous2: Oh, that's easy: She was never a Titan, and prior to the late 90s, she was never a vigilante teen outside of that one Howard Chaykin Elseworlds.
Anonymous3: @Anonymous: partially incorrect actually - as of Secret Origins #20 (1987) (her post-crisis origin) she becomes Batgirl as a 18 year old. So, you're correct Babs is not and never has been a Titan, but since post-crisis she is technically a teen hero - at least in her early BG years
It is unfortunate she's wearing the horrendouse hipster costume, however.