Hot girl, saggy breasts

I met this hot 30 y.o. girl recently and we really clicked. Just last weekend, to my delight, things got serious. We only went to my place to hang out, but then one thing led to another and we started kissing and getting into some foreplay. I couldn't wait to see her naked body and get my tongue all over it.
She took off her bra and out popped her droopy, saggy breasts. I was immediately grossed out and lost my erection. Her breasts sagged almost down to her waist and looked like deflating, wrinkly balloons. I didn't know what to do so I told her that we were moving too fast. She agreed and we just watched a movie and kissed for a while after that and she left. I like her as a person but I am now totally turned off sexually. Is this normal?