At 70, I still do. My reason is that I take an oral chemo drug that causes about 98% of the hair on my legs, and other body areas, to disappear. What's left are very small, scattered patches with dark hair that often looks like dots on my legs. It looks ridiculous and I'd rather have no hair on my legs than spotty patches. However, if you don't have a reason to shave your legs, than don't. Then again, you could give it a try and see how you like it and if you don't, let it grow back and no harm was done.