At what age???

I'm just curious at what age is it ok for you to give your baby adult food? Like bananas, strawberries, and cookies? My friends baby just barley turned 6 month's old and has been eating this stuff for a while. I didn't think they could or should have that stuff at that age? Especially cookies??

* Cathy, I wasn't asking to not let my friend raise her child. Not everyone is out to get others you know. God forbid someone have a question and want to learn before they become a mother right? My hell.😑