This is the time that your body starts slowing down in many different ways. There are many conditions associated with becoming older, such as arthritis, heart disease, Alzheimer's, cancer, stroke, osteoporosis, rheumatoid arthritis - while many of the processes of ageing are biologically determined, there are quite a few others that are lifestyle-related. But more about these in the next section.
The rate at which women go grey is also largely determined by genetics. By the age of forty most women have at least a few grey hairs. Women generally do not suffer from hair loss in the way men do.