I had a post in that thread that addresses this very point. If you were able to add a modest one millimeter per month, in ten years you would have an increase of nearly 4.75" If that’s ever happened, it’s exceedingly rare.
Originally Posted by Lampwick
I’d recommend that everyone interested in this subject take a look at the thread Size’s PE data analysis and a look at the graph datafit2-cool.jpg.Is it possible to gain three or more inches? Based on the above, yes.
Is it likely? Based on the above, not very.
There are too many variables involved to be able to say for sure. Do gains slow or stop because of a biological limit, or due to lack of persistence? Did those who did not gain three inches stop because they decided that they had gained enough?
I believe that everyone has different potential, expressed in different ways. Some gain slowly, some gain more quickly. It’s not difficult for me to believe that some have more growth potential than others. I see this in terms of probabilities.
Your chances of gaining 1/2 inch: good.
One inch: pretty good
Two inches: fair
Three inches: less likely, with diminishing odds for additional size above that.
But surely in a group of this size, there’d be someone for whom too much was never enough. In that case, why aren’t we seeing more members with more than three inches increase? In another thread, I threw out the calculation that if you were able to gain a modest one millimeter per month, that would be 12 millimeters per year, or almost half an inch. Keep that modest rate up, and in five years, you’d have increased 60 millimeters, or more than 2.25"; in ten years, you’d be up by nearly 4.75". Has anyone actually achieved this? If not, why not?