Male menopause or Andropause is a physiological process in men , hormone changes are a natural part of aging in both sexes. These changes are dramatic in females but it is more gradually in men so it is called "menopause-like condition in aging men" The term "male menopause" or "Andropause" is sometimes used to describe decreasing testosterone levels or a reduction in the bioavailability of testosterone related to aging. Female menopause and so-called male menopause are two different situations, however. In women, ovulation ends and hormone production plummets during a relatively short period of time. In men, hormone production and testosterone bioavailability decline more gradually. The effects such as changes in sexual function, energy level or mood tend to be subtle and might go unnoticed for years. Testosterone levels vary greatly among men. In general, however, older men tend to have lower testosterone levels than do younger men. Testosterone levels gradually decline throughout adulthood about 1 percent a year after age 30 on average. By about age 70, the decrease in a man's testosterone level can be as much as 50 percent. Many physicians believe that male menopause or andropause is not a valid concept, as men can continue to reproduce even in old age. Their reproductive systems do not stop working completely, and they do not exhibit a sudden dramatic drops in hormone levels similar to women.