No matter what age you are, at least the first two should be done so that your wishes are followed. There is also a booklet called "Five Wishes. " It has the Power of Attorney and Living Will paperwork in it. It also has questions about how you want your end of life to be from pain management to how you want your family involved. It's a really good booklet. It is accepted and recognized in 42 states now.
Here is the link to the website about it:
If you wish to get it for free look on your states website or contact your local hospice. Our oncologist's office has it too.
Here is a link to look at a sample of it.
Any advice given is based on my experiences and should not be substituted for any medical recommendations. Please speak with your provider before making any changes.