I first saw Ms. Lessing's response to learning the news on Galleycat here Friday morning. I was so tickled by the eighty-seven-year-old's response of "Christ!" that I went looking to see if I could find more.
Of course, YouTube had a Reuters' clip, which I'm attaching here.
Lessing took a lot of critical heat when she began writing sci-fi in the seventies. I wonder if that's what she's alluding to in this clip with her repeated references to "It's been thirty years."