I write about lifetimes from the beginning or individual legs of the journey you find particularly important, meaningful or humorous. Why you laughed, who you loved or what you learned at different points along the way.  Why they stand out and maybe the view or perspective they afforded you at the time.  I write these things because they are important to you and because others, having not been there themselves, may not know these times ever existed or why they matter.  They will be grateful you shared them.