The B-52s. I was surprised to learn (in this Pitchfork piece) that Kate Pierson was born in 1948, had been a full-on hippie, etc. (Though the other band members are older; Fred Schneider seems to be second-oldest surviving member, born in 1951). So some of them were just scraping 30 when they formed the band, and Pierson & Schneider were both around 40 (give or take a few years) when Cosmic Thing broke big.
― Murdered-Out Highlander XLE (morrisp), Friday, 28 February 2020 18:59 (four years ago) link
*though the other band members are younger...
― Murdered-Out Highlander XLE (morrisp), Friday, 28 February 2020 19:01 (four years ago) link
Debbie Harry was 36 when "Rapture" came out
― frogbs, Friday, 28 February 2020 19:12 (four years ago) link