I'm happy that you're content with your life. I really mean that.
When I was 38, I was a lonely person with few prospects for the sort of golden years I'd envisioned for myself. I'd always pictured myself as having a large and loving family in my later years, and could see that the clock was quickly running out for me to make that dream come true.
Long story short, I rectified that situation in the next two years. Today, I'm the proud father of six kids, and have five grandkids. I can't tell you how satisfying and worthwhile it's been to make that happen.
I know it may not be your hope, but it's my hope for you, that you will find a way to create something similar for yourself.
Peace
As I've said, my life is my choice and I completely agree it isn't for everyone. I look at my parents marriage and my sisters marriage and I am very happy for both of them. But I can't put myself in their place and pretend that it would be what I want.
You found what you wanted, perhaps later in life than you would have preferred but the important thing is that you found it. That's the ideal outcome for everyone. It has made your life complete and given you happiness and contentment and I'm very happy for you. I realize that your advice is based on your hope that I find something like that myself. And I truly appreciate your sentiment. But your dreams aren't mine.