Despite being much younger than you my folks are also getting on in years and recently after Dad had a stint in hospital, a part of me was really worried I wouldn't see him again (he came good in the end). I get it, it's hard to imagine a world without them but as of right now, that world doesn't exist for us. I know it's easy to say that you are more than your relationships and I'm sure that at least logically you know that. But it's true, your future isn't defined by others. Treasure the now if you can, even when it's hard. Focus on the reasons you get out of bed everyday, find or rediscover your interests and I promise doing that will help you find your people. When our parents go it won't be easy. It's good to think about it from time to time but you can't let time dictate your life. Because time doesn't care about us. I hope this helps, I'm sorry if it doesn't but at the very least I get it. Take care ❤️
