Answer:
Dear
Erik,
It's
natural for men to notice a gradual decline in sex drive as they
age.
For men, the most likely treatable cause of loss of sex drive is depression.
Less commonly, loss of sex drive may be related to stress, a medication
side effect or a decrease in male sex hormones due to an endocrine
disorder.
Low sexual desire in older men can be caused by a low level of the
hormone androgen.
Androgen are also called androgenic hormones or testoids.
The primary and most well-known androgen is testosterone.
As men age, they start producing less of the male hormone testosterone.
This decline of natural hormones causes the typical andropause
symptoms, like decreased sex drive, depression, low libido, low
sperm production as well as erectile dysfunction.
Testosterone production in males is mainly a testicular function.
Pituitary sex hormones (FSH & LH) stimulate and regulate this
function. Specifically, LH (Luteinizing hormone) stimulates testosterone
production in the testicles. This process is under negative feedback,
meaning that testosterone levels regulate LH secretion. FSH (Follicle
Stimulating Hormone) and testosterone stimulate sperm production.
