If you hold your pee over and over again for many years you will “denervate” the bladder, or deaden the normal nerve signals. When decades have gone by, you can't regrow the nerves that squeeze the bladder.
Every person who gives birth will have a diastasis (recti), that’s a given. It’s the size that will differ from woman to woman and it depends on how much of the ab wall was stretched. Many women from countries throughout Asia and Africa bind. This is where I find the biggest difference between the US and other countries.