Dinah is of Bruce's generation - she should be in her mid-forties or even pushing fifty (probably mid-forties, she's on the lower end compared to Bats and Ollie), though DC tends to fudge that to late thirties with that whole group. Due to sliding timeline, that puts her adolescence, currently, in the 70s. The music she listened to in high school was Aerosmith, Van Halen, the Clash, Tom Petty at the latest, or the Byrds, Janis Joplin, Floyd, and Fleetwood on the early end (or the Beatles, but I feel Dinah would be more drawn to the rebellious protest counterculture).
In Kreisberg's recent shitfest of a retcon where she deafens her friend in high school because her Cry is SO DANGEROUS AND ANGSTY ZOMG, he's wearing a Soundgarden shirt.
So basically they tried to shave fifteen years off her. Of course, in fairness to Kreisberg, that may have been the artist's call, but the way he's been writing them makes "these are young heroes, not grizzled veterans" seem like a deliberate theme, so assuming it was his call seems valid.