What Age Does the Penis Stop Growing?

Penis growth tends to be most dramatic during puberty, which typically lasts from ages 10 to 14. However, it also continues until a man’s early 20s.

That’s because during puberty, testosterone spikes, which causes the penis and testicles to grow larger. But, once growth plates fuse, they can’t grow any longer.


Most boys go through puberty between ages 10 and 14. At this time, their bodies undergo many changes to prepare them for adulthood. Their body hair begins to grow, they get taller and their genitals grow in size. Most people reach their full penis size by age 16 or 17. However, it is important to remember that every person develops differently. Puberty may begin as early as 9 or as late as 18.

During puberty, boys can experience many emotional and sexual changes. For example, they may feel a new sense of independence from their parents. They may also have a stronger desire to explore their sexuality. They might even start ejaculating at night or experience wet dreams. These are all normal reactions to the influx of new hormones.

The penis during puberty is not only growing in length, but also in width. This growth is due to an increase in testosterone levels, which causes the testicles to grow and produce sperm. In addition, the spongy tissue of the penis fills with blood, causing an erection. These changes can cause many boys to be self-conscious about their appearance.

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Fortunately, penis growth usually stops around the end of puberty. In some cases, it continues to grow for a few years after puberty, but it is usually smaller than the size of a full-grown man’s penis.

Teenage Years

As boys grow into teenagers, they experience a growth spurt in their penis and testicles due to an increase in testosterone. This causes the penis to become longer and thicker, and the testicles may begin producing sperm or seminal fluid. Some teens also develop breasts, which is a condition called gynecomastia. These changes occur in the late teenage years, around age 17 or 18. The penis may continue to grow slightly into early adulthood, but it usually reaches its peak size during puberty.

In addition to a growing penis, many teenagers may notice that their skin becomes more wrinkled and the hair on their head starts to grow faster. These physical changes are all a part of puberty, which can cause young men to feel self-conscious about their body, including their penis.

It is important for men to understand that the size of their penis does not determine their sexual ability or pleasure. In fact, the size of a man’s penis is mostly determined by genes. In addition, the length and thickness of the penis can change based on diet, exercise, lifestyle, and medical conditions.

Ultimately, it is up to individuals to make healthy choices to promote penis growth and overall health. In addition, if a man is unhappy with the size of his penis, it is important to consult a doctor to learn about the possibility of enlarging the penis.

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Early Adulthood

At the end of puberty, the penis stops growing in length and starts to grow in width (referred to as girth). In most cases, the penis will be at its full size by a person’s early 20s. A person’s height growth will also be complete around this time.

The rate of penis growth during adolescence varies from one individual to the next. However, according to a 2010 study, most people reach their full penis length and girth during the late teen years. At this point, a person will usually have a penis that is 5.1 inches to 5.7 inches in length when it’s erect.

During this time, a man’s testicles will also begin to grow. This occurs when a young man’s testosterone levels spike during puberty. It causes secondary sexual characteristics to start developing, and it prompts the testicles to produce sperm and seminal fluid. The testicles will typically achieve their full length and girth around the same time as the penis.

In some rare cases, a person’s penis may continue to grow after the age of 18. However, this is typically a sign that the male has a medically diagnosed condition known as micropenis. A doctor will be able to provide support and reassurance about this issue, and they can investigate the cause of the issue and put together a treatment plan.

Late Adulthood

Just as genes determine how tall a person gets, they also play a role in the length and girth of the penis. Testosterone is a big contributor to penis growth during puberty, so boys with lower testosterone levels may have smaller penises. The good news is, a man can raise his testosterone level naturally through healthy eating and exercise. Certain chemicals known as perfluoroalkyl compounds (PFAS) have also been linked to low testosterone levels in young men.

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The penis continues to grow marginally throughout a boy’s younger years, but most significant growth occurs during puberty thanks to the testosterone boost. Peak penis growth happens between the ages of 11 and 15, with about half an inch of increase each year.

During late adulthood, the penis continues to grow but at a much slower rate than during puberty. Most men stop growing at age 21 but there is still a lot of individual variation.

Some men worry about the size of their penis, but it is important to remember that the size of a guy’s penis does not correlate with sexual pleasure or performance. Many factors other than penis size contribute to sexual satisfaction, including communication, intimacy, and technique. Those who are concerned about the appearance of their penis can speak to a doctor or mental health professional for support and reassurance.

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