Been brain rotting older!Katsuki who’s got crows feet, deep set eyes, and smile lines. Whose louder than ever due to hearing loss. Laughs lauder, talks louder, and overall does not notice (or care) about just how loud he is.
Older!katsuki that says “HUH?!” often and makes grunting, hacking and coughing, noises like an old man. I imagine him to wear hearing aids and reading glasses. (When he forgets his glasses he does that boomer thing where they squint their eyes and push their phone an arms length away to see).
Older!katsuki with a raspier and more gruff voice that’s more pronounced in the morning and when he’s not yelling
Older!katsuki who is still extremely beefy snd muscular from years of hard work but age has slowed down his metabolism, giving him a slight pudge.