In the modern world we compress the penis with clothes all life. But in some African tribes their penises really hang, because they have been running around all life long with it dangling, and flapping between their legs. Also penis enlargement is a step into adulthood for them. They put their penis in a hole in a branch, and do something with that. Maybe they just stretch in it all day long or something. Very interesting.
So extenders sounds like a very good method, if you can have it on for a really long time. I have read some reviews about extenders on product sites, and some men claims they have increased their penis length with 5 cm within one year of using it. It seams feasible to me. But you never know the validity of these reviews.
Also one reviewer wrote that his glans became bigger from wearing a clamp based extender. As I said I can't validate their claims. But really interesting.
But the longer you wear an extender the longer you will get, there is no choice for the penis to stay the same. That is my mindset, that is: Make the penis to have no choice but to grow.