I don’t think it is a physical age. I think it is a mental outlook. Even though at 61 I’m still doing goofy kid stuff, I won’t say I still am in my youth. My innocence left a long time ago. My enjoyment of life never did so I don’t think or act “old”.
I’m with the Wulf, only seven years their junior.
I lost my agility, and feel slightly less youthful in a physical sense, but my mind is childlike, I say with pleasure.
Our younger one is an ace in her field, so she’ll prob go find a cool job somewhere far from home after college. However, our older one prefers simple solutions and has asked us if we would will our house to her if we pass away. I’m not so sure she will be moving away after she graduates from college.