Haha, bro it's all over the world i guess. I've also seen a child acting and making decisions as a an adult, at the other hand, seeing an adult act and make decisions like a child. This alone shows that maturity Isn't defined by age.

The older people acting as if they know everything because of their age also happens here in my environment. I met an old man one day trying to restore his smartphone. He tried and tried but couldn't, i walked down to help him out but he claimed he can. After some days, he damaged the phone, was so sad.

Older people should be open to learning because we're now living in a digital world. Best of luck.