Not an easy thing to do. Think for a moment, or more for some, of what constructed and instrumented your life. To start with, you'll need more gigabits than a cheap Chinese iPhone to recollect it all. So many events; childhood holidays, grandma, divorce lawyers, first bike, first love, first tumble in the back seat of a car, marriages births, and wakes. Untold peaks and valleys to be sure. But, let's just say a splinter group of militant Wikipedia bikers have abducted you and will have their way with you unless you can tell them about your life in one precise sentence. Daunting to say the least. Most would cop out and jabber something like, "Happy kid, confused teen, miserable adult and cranky geriatric." or, "I lived my fantasies, and was cheerful and happy all of my life until my drug supplier was arrested." Poorly thought out.
Now, as for me, I've given this a lot of thought. First off, it's impossible, but so is Donald Trump, so there must be a way. My life in one sentence............

"I was given this life because I was strong enough to live it and thus gifted with Mom and Dad, family, school buddies, various loves, first Super Bowl, Wifey, my kids, grandkids, great grandkids, sad failures, great successes, a gentle old age, fantasy football and the eternal lasting love of Wifey."  

Yep....that says it all.