Skin Changes With Age

I know that in the mid 20's-people begin to lose elasticity from their skin and the skin of their face is not as strong as it was before. It becomes looser. I know that the skin changes with aging, but what about bones? What happens to the bones as people age, the skull will also change with age?

Well, everything changes with age. I know that teeth change with age - they get more worn, etc. skull, I do not know.

I have an aunt who, in remission from a bone cancer and I am sure the cancer and chemotherapy has changed the structure of bones somehow.

yep. you fat so differnet men and women

They vary in several ways: size, shape, length and content of calcium.
The bone consists of calcium salts, primarily hydroxyapatite (calcium phosphate hydrate), the cells within it (osteocytes,), cells outside of it (or osteoblasts producers bone, periosteum), and within it, in the lining of the bone marrow (or bone-eating osteoclasts) ...
With age, collagen (type I) and osteocytes, tend to decrease in number, and the elastic tissue around the bones clean.
This is an enlargement or magnification of the shape of bones, and loss of calcium salts (osteoblasts lazy), provides a bone more fragile, more porous, and less content of calcium (osteoporosis), which means the bone is weaker and more porous (earlier for women than men )....
Other bones tend to reduce calcium loss (vertebrae) and that explains why people over 65 in general, become shorter than before ... (Total 5-6% of the previous height)
So, yes, the skeleton is one of the structures that the greatest change with aging ...
The skull is a strange case in which the main change is almost reduced to tooth loss, and changes in mandibular shape only, and is much less affected by osteoporosis than other bones, because bones of the skull have a high activity of osteoblasts, almost unaffected by age. (Exception to the common rule)