1, testicular “shrinkage”. Men generally since 50-60 years old, with the growth of age, testicular interstitial cells can gradually aging and degenerative changes, so that the secretion of testosterone is greatly reduced, testicular volume is also relatively reduced, when the body tissues and organs gradually aging, sexual function is also gradually declining. 2, the appearance of the penis has changed. When men reach their forties, the glans will gradually lose its purple-red color, which is mainly due to the reduction of blood running. Due to the decline in androgen levels, the pubic hair of the penis will also become thinner and thinner, gradually returning to its pre-pubescent hairless state. In addition, just like other parts of the body, the epidermis of the penis will also become flaccid. 3. Size becomes smaller. Generally speaking, the male penis basically stops developing after puberty. As age increases, the length and thickness of the penis, will also change a little. From the age of 50 to 70, the size of the penis will shrink 1-3 cm. 4, the penis is more “curved”. If there are scars on the penis and uneven accumulation of scars, the penis may become more and more curved, which is called penile sclerosis, mostly seen in middle-aged people, it can cause pain during erection, sexual intercourse difficulties, so patients should actively seek medical attention. 5.Decreased sensitivity. The most obvious manifestation is the decrease in the number of sexual impulses. after the age of 60, the average number of orgasms per year is 10-50 times less than the age of 30, which varies from person to person. This brings about a delayed sexual response, low semen volume, extreme fatigue after sex, and a greatly prolonged non-return period (i.e. the time between two consecutive erections and ejaculations).