Condolences for your dad. 42 here, my dad is showing his age majorly now.

Looking back I know I lived every single hour but huge leaps of time are just gone. Like, entire jobs I worked for years I have maybe a half dozen memories. On top of that our work product is gone, the company is gone, the building is gone, the entire industry is changed... it's like it was all a dream. I definitely understand the old man looking at a city and saying, "this was all orchards". I used to think it was a wistful phrase, but it's also an expression of disbelief. When we were embedded it all seemed so important. But it all shuffled off with zero fanfare. It really changes how you experience life, and that's how I "feel old".