My answer must depend on at which point of my life I had asked myself this question.
Until I was around 25, I would confindetly have asserted that as my 75th birthday approached I would have husband, children, grandchildren and most of the circle of friends I had then.
By my earlier thirties, I had realised that husband might still be a possiblity, and he was ,nearly 20 years later but that the ship had probably sailed regarding biological children (as indeed it had).
Now aged 74 and counting, I am a widow, with two adults who regard me as their mum, and whom I love as my children, although we are neither biologically nor legally related, my younger sister died nearly ten years ago, which I certainly did not anticipate, nor the fact that only two of my friends from young adulthood are still part of my life, plus two schoolfriends, whom I only contact in cyberspace, as we live in different countries.
On the positive side, I am finacially far better off than I ever anticipated being, although that I would cheerfully have renounced if I could have traded it for loved ones, I still have my health, have a small circle of good friends, all who have come into my life in later years, and still find life good.