Question regarding power

So, I am wondering what kind of powers someone can possess? Specifically, I would like to know if it is possible to live for as long as one wishes within a youthful capable body.

The reason I would like to know this is because when I look at enlightenment I have no idea how long this will take for me to achieve and I would prefer not to die since I have no memory of my previous lives which would mean I would forget all the things I have learned in this one.

Any help would be much appreciated.

Thanks beforehand!