I was wondering at what age should I give my daughter POA?

The "springing" type of POA seems to be very popular here on the forum, but getting it sprung has been a real roadblock for some people. My mom's POA was en force as soon as the ink was dry and I was able to help her with banking and bill payments long before she became incapacitated. The way I look at it setting up POA is kind of like selecting a guardian for your minor children, something you tuck away and hopefully never need. If, however, you have any doubts about the trustworthiness of those in your family then a springing POA may be the only way to go.

Sooner the better, really. A springing DPOA comes into force only when it's needed - bearing in mind it may never be needed, of course - and otherwise just sits in the file minding its own business. Thus, there are zero drawbacks to having it ready; just remember to revisit it every so often to make sure it's still fit for purpose.

Ok thank you I appreciate your response.

I think you can set it up now, with the provision that the POA ONLY kicks in when you are proven to be incapable of making your own decisions.