@thisismarilynb - I think I understand your feelings a little bit since I am "my father's child" and I have now outlived him. This year I have made a very deliberate effort to live in the moment - savor what I am seeing, hearing, tasting - without worrying about taking pictures, who will do the dishes, or what is on my to-do list.

A few years ago, I had a conversation with my fabric guy. We had become friends over the years based on our mutual love of fabrics, and he always wanted to hear about my current projects, my kids, etc.
One day I walked in and asked how he was. He replied, "I need a hug. I am 90 years old and my last schoolmate just died." We hugged, chatted for a while about this and that, and he ended our conversation with "Don't worry about me, I know my time is coming. Just keep talking to me about your life, and I'll talk about my memories." Then he told the old (probably vaudeville) joke. "I'm at the age where I don't even buy green bananas" and we laughed. Five years later he passed peacefully in his sleep. I miss Sid every time I walk into his store - even though it is the same place and his son and a long-time employee run it, it doesn't feel the same.

So that "untethered feeling" can happen at any age. May I ask what you do to try to stay in the moment?