You're a millennial? I wouldn't have thought it.
I don't really associate food with an age, I guess I associate it with being good for me, tasty and enjoyable, or not. I love avocado on toast and have it often. I tend to do it for breakfast a lot.
I mash it up, but leave it chunky but and finely chop in a little mint (not too much), and red onion into it and mix in some crumbled feta cheese then slather it on buttered olive rye toast or some such legit bread. Sometimes I top with a couple poached eggs and sometimes not and occasionally I sprinkle very thinly sliced radish on top for it's pepperyness and crunch. Grind on some rock salt and black pepper and you're done. It all takes no more than about 8-10 minutes and is sustainable energy for much of the day.
Sometimes I do it for dinner too, as with this post below which pretty mush shows the above method. I've added bacon and mushrooms on the side to beef it up a little.
https://peakd.com/hive-120586/@galenkp/g-dog-cooks-breakfast-dinner
I'll be good on sourdough as you mention and is also good with some dukkha sprinkled on for another element of flavour and crunch. There's lot of ways to make this legit meal or snack.
I've been called an old soul on occasion. Much more often, I've been called immature.