What age does a boy start getting bigger down there?

My younger brother looks bigger than my older brother.
I haven't asked either one just seems bigger to me. Is that normal?
I looked at a ruler to try and guess and he looks like he's about 6 inches just hanging no erection and he's 10 my other brother is 13 and about 5.5 inches
I tried looking on line can't seem to get any answers
2 11

Most Helpful Guys

  • Ok so do you me naturally or do you mean when he gets turned on naturally it just grows from the day you're born
    For me I think I was about 11 12 13 and like a chemical inbalance happened to me and within a week's time my cock grow like crazy it was one of the most weirdest X ever I didn't know if I was coming or going or what was happening but it's like my whole body just physically changed
    You know if you're talking about a hard-on that could happen at any moment lol especially reading questions on here

  • Puberty can start from 9 to 16. After growing hair, getting acne

Most Helpful Girls

  • Grew up with older brothers, they all hit at different times. Not sure where they ended up size wise. They all looked big to me when I saw them and they all bragged that they were even bigger. I don't think it really means anything if a younger brother is larger or smaller than an older brother. He may be gifted, or he may have matured earlier and that's all he'll get while the older brother is still growing. Who knows...

    • So yours brag too lol?

  • Lol eeww. ... but I think at like 10 they start to... whatever puberty

    • Lol... true

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What Girls & Guys Said

13 44
  • Well, it's different for all boys, but typically our genitals start growing not long after we start puberty. We typically achieve sexual maturity long before our bodies are finished growing. I started puberty at 7 and it was pubic hair and genital growth that were my first signs of puberty.

    • wow are youbig too?

    • Yea, I'd say I'm big, everyone I've been with has told me so, and I easily bottom out at their cervix before I'm balls deep. I have had one girl tell me they have had someone thicker than me, but that's about it.

  • Well, boys tend to begin puberty at about 10 or 11, but 6 inches is bigger than average for a fully grown erect adult, I simply cannot believe that a 10 yo flaccid child has a bigger penis than an adult with an erection… I think you were looking at the wrong side of the ruler and it was cm you saw, but even then 6cm flaccid, is still mutation level huge for a peri pubescent child of 10! Highly unbelievable. Also, maybe you should stop looking at your brothers for long enough that you can gauge how big their penises are. The only correct answer for an 18yo girl who comes from a family of nudists, when asked how big her brothers dicks are is “I have no fucking idea you perv, I’ve never actually looked at them long enough to even begin to guess, and I NEVER will, grow up!”.

  • WTF!!!

    You measuring your BROTHERS penis... yeah that not normal and bit sick you need to stop because it sound kind like a pedophile thing to be obsessing about.

    I never took notice of it until I was around 14 or so and I was 6 inches then, and I am 7 inches now.

  • Congratulations on a troll of the day award

    • @snakeboop 👍 x

    • I agree with you.

    • 😂😂😂🤣🤣🤣🤔

  • It can start around age 9 and go on until about 18.

    You can have a 13 old boy with pretty much an adult cock.

    a guy in my class at 14 had pretty much an 8 inch cock.

    It can also vary between brothers.

    everyone has a different puberty journey.

  • It sounds like your family is one in which you openly see each other nude. That is normal for some families and nothing wrong with it. Some guys on here do not seem to understand that.
    But since you do see them nude, you should have a good idea about what age guys start developing. It varies. And not odd that younger boys can be bigger than their brothers.

    • Thanks!

  • Debbie... everyone is different and a penis that looks big while soft may not get much bigger during an erection. It varies with all guys as they go through puberty. How did they let you see their penises that close to see how big they were?

    • Someone had to say it.

  • During teen age, i. e. untill 20 or 21. Thats on paper, in real have heard some were found bigger later then on early age. Strange

  • What a dick looks like nonerect is no indicator on erect size.

  • Well that's a really weird question. Why would you even care? I wouldn't want to see my brother's penis if I had a brother. The first one that I ever saw in real life was on my wedding night and It impressed me. Wait for the suspense. and besides how do you know their penis's weren't erect when you saw them?

  • You can't judge a length when it's not erect. All you know it's will not shrink. So a small can become bigger than one that looks big, it all depends.

  • Seens a bit weird that you'd be so interested in your brother's dicks. Anyhow size can change from as young as 9 or 10, but size and appearance is different for ever guy, also there are showers and growers. Just because they are brothers doesn't nean they would be the same, I'm considerably bigger than my brother according to his ex girlfriend.

  • They start getting bigger around 12 years old.

  • Glad you get to see their flaccid penises. Probably can't tell which is longer until they are erect, but 5.5 and 6 inches flaccid, means a pretty long penis erect. Probably 7 inches erect at least for the 6 inch one and close with the 5.5 one.

    • My answer was not really an 'answer" to your question, but as others said, probably at "puberty", maybe early teens?

  • Guys have different size penises, done bigger, some smaller. It would be unusual for your brothers to have the same size penis.

  • For me it was about 10 my penis length then balls hung much lower I could cum at 11. then girth and hair at the same time.

  • Why are you checking out your minor brothers dicks

  • Sounds a bit like you're trolling, but in case you're not... if anything I'd say a ten year old having a 6 inch one is abnormal. Guys start growing and could end up being lots of different lengths. It'll start growing anywhere between 9 and 13 years old and will stop once puberty is complete.

  • I don't know but according to my experience I started to grow long when I was 12 years old.
    and why you care so much about your brother's penis.

  • I wonder how big you are downstairs lady? around 12 it starts growing

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