The most popular short haircut for an older woman is the classic bob. It's a versatile and timeless hairstyle that can be customized to suit different face shapes and hair textures. Another popular short haircut for older women is the pixie cut, which is a low-maintenance and edgy hairstyle that can be styled in different ways. Layered cuts and angled bobs are also popular options for those looking for a shorter hairstyle. Ultimately, the best short haircut for an older woman will depend on their personal preferences, hair type, and face shape.