I will be 80 this year. My husband died at 81, 4 years ago, after many years of ill-health. I have lost a lot friends in the last few years, and another has been 'on the brink' for months. She is 90, riddled with cancer, and the most serene person I have ever known!
Another elderly friend has vowed to drop dead, from a heart attack, while being chased by a jealous wife! 
I do wonder when my own time will come, and hope that it will be quick and peaceful. It grieves me that I probably won't see my 2 year-old Aussie GD grow up, but her parents are getting married in November, in Australia, and I WILL be walking my DD down the aisle! The plane tickets are booked, and death is not expected to intrude on those plans!
I don't know how many more times this elderly body can sit through that long journey, but I hope to be able to visit for a few more years. Time will tell. Thank heavens for Facetime! I was up 'til 2 a.m. chatting to them, this morning.
Death is just the next exciting stage in our lives, when we find out "what's around the corner." Maybe we just get recycled, like most of nature does. Maybe there is a wonderful after-life. Who knows? Yes, I will regret leaving this earth, and the people I love, but they will get on with their own lives, as everyone does. I hope that they will remember me fondly.