Gah! I just wrote a long response and it didn't save. Anyway, in summary....I'm doing really well with the 3 meals a day thing (all week, with only one exception!) and have found that at the very least I'm hungry for dinner each night with my conscious efforts to avoid snacking. Going to stick with this habit for another week to master it before moving onto the next one.
I still have some frustrations about my crappy metabolism though, which seems to have gone into the toilet over the past 2 years. I looked over my MFP logs from 2014-2015 and back then I was eating more sugar and drinking more lattes and craft beer (my 3 vices that I struggle so hard to give up or cut down) and yet, the great mystery -- I was 3 to 5 pounds lighter than I am now. I just don't get it. I am still at a healthy weight for my height, so maybe it's time to just give up on the dream of being a lean, light, fast runner and just accept my body for what it is.
This may or may not apply, but I've noticed that when I enjoy my food more, I'm satisfied with less of it. So, I find myself leaner and happier when eating the "extras" that everybody says to cut out, and seriously struggling with weight and body image whenever I'm counting things and eating bland diet gruel. For me, it wasn't age or metabolism, it was a joy deficiency.
Self-acceptance is so important, wherever we may be in the journey. I also love Georgie's advice to think in terms of a goal life and not a goal weight.