I find it sad how often he repeats "I'm an old man" as a mantra to disqualify himself of positive experiences. And like... I won't begrudge him the right to self-identify, but the only thing in this new reality making it so is him. He can start being a dark elf maiden anytime if it'd make him happier.
So a thing to point out is that Mc has also been conditioned to have such a low self worth.
its not even just "I'm an old man" its more of "I'm worthless, unlikable, and a drain of an old man" just look at the way Mc first introduced themselves
["I'm middle aged man in my mid 40's, single, and bit of an awkward otaku.
my boss scolds me for my lack of energy and my juniors dont respect me.
I wake up in this old and cramped apartment and this old man will continue the same routine tomorrow as well..."]
Mc has given up on life, and to cement it more
["im just living amilessly, consuming entertainment....I dont strongly seek or desire anything.....Ah, is see....i have no attachment to my original world."]
Mc is gonna have to find their own self worth and simply a will to live, then you'll get your dark elf maiden life.