Testosterone is a powerful hormone, with the ability to control sex drive, regulate sperm production, promote muscle mass, increase energy, and even influence human behavior (such as aggression and competitiveness). It’s no wonder that a decrease in testosterone would cause quite a stir. However, it is a natural part of aging.
Testosterone plays an important role in shaping the developing fetus during pregnancy. It drives the development of the male reproductive system. Testosterone also masculinizes the brain.testosterone levels have to fall within a very narrow margin in order for the fetal brain to be healthy. High levels of fetal testosterone may be linked to autism.low levels of fetal testosterone may boost your chances of getting Alzheimer’s disease later in life.
Testosterone levels are at their highest during adolescence and early adulthood. The first physical signs of testosterone, or androgens, in the body are apparent during puberty. A boy’s voice changes, his shoulders broaden, and his facial structure becomes more masculine. But as men get older, their testosterone levels decline about 1 percent per year after age 30.
|Age:||T Level (ng/dL):||Age:||T Level (ng/dL):|
|0-5 months||75-400||0-5 months||20-80|
|6 mos.-9 yrs.||<7-20||6 mos.-9 yrs.||<7-20|
|10-11 yrs.||<7-130||10-11 yrs.||<7-44|
|12-13 yrs.||<7-800||12-16 yrs.||<7-75|
|14 yrs.||<7-1,200||17-18 yrs.||20-75|
|15-16 yrs.||100-1,200||19+ yrs.||8-60|
|Avg. Adult Male||270-1,070||Avg. Adult Female||15-70|
|30+ yrs.||-1% per year|
low testosterone levels can cause changes in sexual function, including:
Other signs of decreased testosterone levels include:
The normal range of testosterone levels in healthy adult males is between 280 to 1,100 nanograms per deciliter (ng/dL).
While the symptoms described here are considered a normal part of aging, they could also be signs of several underlying factors. These include: