She chooses poverty over a rich husband—claiming love that money would ruin and even promising age won't matter.

“I’m glad you are poor. I couldn’t bear a rich husband,” said Jo decidedly, adding in a softer tone, “Don’t fear poverty. I’ve known it long enough to lose my dread and be happy working for those I love, and don’t call yourself old—forty is the prime of life. I couldn’t help loving you if you were seventy!”