I consider this writing thing that I do - a privilege - a gift from God - if you will.
As I have traveled from one book event to another, the most common expression that seems to be voiced is; "I should write a book, I could write so much about my life, etc., etc...."
My response is always the same; "Why don't you?"
Everybody has a story to write. Whether it be your memoirs, something to pass on to generations yet to come or a story that you long to spin - do it - do it now!
I have sat and chatted with young and old alike. My message to those 'older' folks with so very much stored in that wonderful computer that God gave us - our brain, I simply advise my new friends to write down their thoughts and memories as they surface. It can encompass a life-time, a career, a stint in the military, a special person in your life or maybe your favorite vacation. Whether it be a word, a sentence or a chapter, get it down now. You'll be surprised at how quickly that brain will hunt and find - the rest of the story.
To the younger folks - 'the kids' - my best advice is to keep a journal. As we walk through this world, the experiences continue to manifest, day by day, year by year.
Grab a pen or head for that keyboard - start writing ASAP - you will not regret it - I promise!
For me - the thought of writing came after a bout with cancer and some serious surgery. God was good to me - he had something more for me to do.
After spending 25+ years in a corporate environment and writing what I needed to write, a certain mental revelation struck me. "Write what you want to write and start writing - now."
... and I'm so glad that I did!