The appearance of aged persons is too well known to make detailed description necessary. The skin of the face is dry and wrinkled and generally pale. The hairs on the head and the body are white. The back is bent, and the gait is slow and laborious, whilst the memory is weak. Such are the most familiar traits of old age.
Lots of kids, including my son, have trouble making the leap from reading words or a few sentences in picture books to chapter books. Chapters are often long... 10 pages can seem like a lifetime to a young reader. Then reading becomes laborious and serious. That's why some of the chapters in my books are very short.