Penis growth after procedure?

Some peoples penises continue to grow well after they turn 18 some ive heard even till 26 so I was wondering if regenerative foreskin would halt that growth. Also I have heard that circumcision makes penises not as long as they should because there is not enough skin. so I was wondering if the new foreskin would be able to grow alongside the rest of the penis or would the foreskin become disproportionate?