I live in CA, and the law here states a puppy can not be sold until at least 8 weeks of age. A reputable breeder any where, will always keep them longer than 8 weeks, before selling them.
The eldest crested I have now (my heart dog), will be 12 years old, later this year. She came from a one time hobby breeder, who sent her home with me at 7 weeks of age! I didn't know better at the time, and the law hadn't been enacted in CA, at that time. I ended up having to take her to puppy kindergarten classes, as I had some aggression issues with her. When she came home, I had a male standard poodle, and a male 5 year old crested. Ruby was just a teeny thing...so teeny, she wore the ankle part of a wool man's sock, with two holes made for her front feet. There was nothing available at the time that was small enough for her. She came home and started bossing the other two dogs around, and challenging me! This little snip of a puppy! She would lock eyes with me, and NOT look away! The trainer told me that if I was going to let that happen, that I must never be the one to look away first. To this day she still does it, but it's with total love in her eyes. Often her eyes even tear up, and then she will lean into me, to hold her tighter. In her life, I am the only one who exists. She still bosses all the other dogs around, and they accept it.