If you want, skip right to www.theconversationproject.org to see what they say Before you read what I wrote by way of an intro, or continue as you like. Either way, good for you for 'taking the first step and Thinking about doing something or encouraging a friend or others to do so if you're all set...'
No one knows exactly how long they will live or moreover How they Might die. Most folks really don't want to think about it.