Biological aging is a diverse topic, partly because of the many processes affected by the aging of an organism. Not only are these processes manifested in normal physiological and molecular changes, but they also include a long list of age-associated diseases such as cancer, diabetes, Alzheimer disease, and osteoporosis, to name but a few. Partly as a result of the encompassing nature of aging, many new tools for its analysis have emerged, especially within the past decade.