Grace Slick in fact (according to Wikipedia) set the record for being the oldest female vocalist on a US number one hit-twice. Once with "We Built This City" (she was 46 when it hit #1) and again with "Nothing's Gonna Stop Us Now" when she was 47. Cher broke the record in 1999 at age 53 with that horribly annoying song, "Believe."
I like Grace Slick, actually. The Jefferson Starship albums she was on were good, mainly because of her captivating voice. Although her politics are nuts!
She's 66 now, BTW, I hadn't realized how old she was (born Oct. 30, 1939).
She admits now she did it for the money. Typical...left-winger enjoying the virtues of capitalism. Nowadays she is still the *evil* capitalist as she sells her paintings for 2 grand a piece.
"We Built This City" was a horrible song. "Nothing's Gonna Stop us Now" is at least tolerable.