Some people have difficulty growing their hair beyond a certain length because they have a short active phase of growth. On the other hand, people with very long hair have a long active phase of growth. The hair on the arms, legs, eyelashes, and eyebrows have a very short active growth phase of about 30-45 days, explaining why they are so much shorter than scalp hair. Transplanted hair doesn't know it's in a new location and so eyelash transplants from the scalp need to be trimmed every few weeks to avoid looking like a tarantula.
By the way, while men tend to prefer women with long hair (ever see a painting of Eve with a buzz cut?), women, especially as they age, seem to prefer wearing shorter hair. After all, long hair on a mature, sophisticated woman can seem about as appropriate as shoveling soup with your fingers. More importantly, our hair tells us a ton about our overall health status, as the growth or loss of hair can signal other malfunctions going on inside of our bodies.
Find out more about this book:YOU: Being Beautiful: The Owner's Manual to Inner and Outer Beauty