This fallacy of a crone being associated with old age originated in centuries past, when women who had achieved the status of crone did so without the help of modern medicine and proper nutrition. Before the 1900's, women didn't live many more years past the age of menopause. And if they did, they to look much older than they actually were. One might also think that this is how the term "crone" became associated with death. But in fact, the ties between death and the crone originated from the followers of the Great Mother Goddess who believed that the crone had the ability to both restore and take away life.
Thankfully, times are changing, and for the most part, the word "crone" is now accurately being used as a synonym for a woman who not only embodies postmenopausal wisdom, but shares it with the world. It is the time when the wisdom and healing of a woman's menopausal journey quickens in her heart, and her desire to share all that has learned drives her back to the outer world. And so, just as the maiden years symbolized the time when a woman gave birth to herself, and the childbearing years the time when she gave birth to others, the crone years symbolize the time when a woman gives birth to the planet by sharing all that she has learned.
Boylan, K. M. (2000). The seven sacred rites of menopause. Santa Monica, CA: Santa Monica Press LLC.