The male reproductive organs, penis and testicles, cannot develop again after adulthood.
In the process of male growth and development, from the age of about 6 years old to the stage of puberty, the genitals will grow slowly with the development of the body, but not obvious. At around 11~12 years old, puberty officially begins, the level of androgen in the body increases, secondary sexual characteristics such as pubic hair and beard begin to appear, and the penis also rapidly increases in size and thickness.
In adulthood, the reproductive system is basically mature and the reproductive organs are basically stereotyped. Growth and development basically stop after adulthood, so the male organ will not develop again. The development of the male organ is closely related to hormones, race, heredity, diet, etc. Everyone’s is different, so as long as you can have sex smoothly, you don’t need to be overly concerned about the size.
If you have any discomfort in your genitals, you can seek medical help from a doctor.