When Does Your Penis Stop Growing?

Puberty brings a lot of changes to the body, especially for boys. One common question many teens and even young adults ask is: “When does your penis stop growing?” It’s a normal and important topic, especially when you're curious about your body's development.

In this blog, we’ll explain when the penis typically stops growing, how growth works, what age it usually stops, and what factors affect penis size. We’ll also explore common concerns from platforms like Reddit and Quora to give you a clearer picture.

When Does Your Penile Usually Start and Stop Growing?

The penis begins to grow during puberty, which usually starts between the ages of 9 and 14. This stage includes physical changes like the growth of facial hair, deepening of the voice, and yes, enlargement of the penis and testicles.

So, when does your penis start and stop growing?

• Start of growth: Around age 11 to 13

• Rapid growth: Ages 13 to 16

• Slower growth: Up to age 18 to 21

• Fully stops: Around age 21, although it may stop earlier for some

This means that if you're asking, “What age does your penile stop growing?” — the answer is usually by your early 20s.

When Does Your Penis Stop Growing in Length and Girth?

Penis growth happens in both length and girth (width):

• Length usually grows faster during the earlier part of puberty (around ages 11–15)

• Girth increases more gradually and continues even after the length has mostly finished growing

So, when does your penis stop growing in length? Usually by age 16 to 18.

And when does your penis stop growing in girth? It can continue until you're about 20 to 21 years old.

Remember: growth doesn’t happen all at once. Some grow faster, some slower.

When Does Your Penile Fully Stop Growing?

You might see the question asked many ways:

• When does your penis fully stop growing?

• When does your penis size stop growing?

• When does your penis stop growing in size?

All of these are really asking the same thing — and the answer is:
Most boys stop seeing noticeable penis growth between the ages of 18 and 21.

If you're older than 21 and wondering if it will still grow, it’s unlikely unless you experience a hormonal shift or medical condition.

What Factors Affect Penis Growth?

Several things affect when and how your penis grows:

• Genetics: If men in your family matured earlier or had certain sizes, you may follow the same trend.

• Hormones: Testosterone is the key hormone for growth. Low levels may slow or stop growth.

• Overall health: Poor nutrition or medical conditions can delay development.

• Puberty timing: Starting puberty earlier or later can shift when your penis stops growing.

If you’re worried about your growth or feel like something isn’t right, it’s always a good idea to talk to a doctor.

When Does Your Penis Stop Growing? Reddit and Quora Discussions

On websites like Reddit and Quora, people ask:

• When does your penis stop growing Reddit?

• When does your penis stop growing Quora?

Here are some common answers found online:

• “Mine stopped around 17, but I think I filled out in girth till 20.”

• “I had a growth spurt at 15, then not much after that.”

• “Still looked a little different at 20 compared to 18.”

These stories show how growth varies for everyone. Just because someone else’s experience was different doesn’t mean yours is wrong.

Is It Normal to Be Worried?

Yes, it’s totally normal. Many boys compare themselves to others in gym class or online. But remember:

• Everyone grows at their own pace

• Penis size has no impact on your value as a person

• What matters most is confidence, not size

If you're still wondering, “When does your penis stop growing?” — and you're under 21 — it's very likely you're still developing.

Does Penis Growth Stop After Puberty?

Another version of this question is:
“When does your penis stop growing after puberty?”

Once your body stops going through changes — your voice stops deepening, your height stabilizes, facial hair grows fully — then your penis is also likely finished growing.

That’s why the late teens to early 20s are considered the typical final stage of penis development.

✅ Summary of Common Questions

🔹 When does your penis stop growing?

Most males experience complete penis growth by age 18 to 21.

🔹 When does your penis start and stop growing?

It starts around age 11 to 13 and stops by age 21 for most people.

🔹 When does your penis stop growing in length?

Length growth usually ends around age 16 to 18.

🔹 When does your penis stop growing in girth?

Girth can continue developing slightly until age 21.

🔹 When does your penis size fully stop growing?

Your penis typically stops changing in size, shape, and thickness after puberty, around age 21.

🔹 What age does your penis stop growing?

Growth often stops between 18 to 21 years old, depending on when puberty began.

🔹 Is it normal for penis growth to stop early?

Yes — growth can finish earlier (around 16–17) for some, depending on genetics and hormone levels.

🔹 Does your penis stop growing after puberty?

Yes. Once puberty ends, penis growth usually stops as well.

Final Thoughts

The question “When does your penis stop growing?” is one that almost every boy thinks about at some point. And while growth patterns vary, most penis development is complete by age 21. There’s no need to stress if you're growing slower or differently than others.

The most important thing is that your body develops in a healthy way. If you’re ever worried, confused, or comparing yourself too much, talk to a healthcare provider. They can help you understand what’s normal for your body.