I've grown up around electronic music, metal, and pop & rock music from the 70ies & 80ies, and I still like some of that.
With the advent of electronic instruments, and music made on computers in the 70ies-90ies, it becomes ever harder to audibly assign an era to the music ... even the "cheap" electronic sounds from the 70ies & 80ies are having a revival b/c they're favorites among electronic musicians, and thus are present even in modern pop music. So, some modern songs like Gotye's & Kimbra's "Somebody that I used to know" or artists like Lana Del Rey or Caro Emerald are played on adult contemporary radio.
Also, guitar music like metal and rock are often similar to previous decades nowadays ...
I often wondered how young people know how to distinguish modern songs from earlier songs ... is this still possible? I mean, music of the 50ies and 60ies and even the 70ies had a distinguished sound, that was easily detectable, but ever since the 80ies, it should have become harder ...