Depends on the car and how it’s aquired its miles. Frinstance, mine is a faded executive barge, so its 100K basically kills its value- nobody who wants a posh car with all the toys wants an old one. But mechanically it’s in great shape, and most likely it’s spent most of its time munching motorways.
My old Focus was likewise on 100K, and because it was a low-end Focus estate it’s the sort of car that gets bought and sold cheap and run forever, so 100K wasn’t that many miles. But ironically, it was shagged because it had taken longer to get to 100K- so by the time it needed work done to it, every bolt needed a gas axe to get it out, and it made it a nightmare to work on.
Personally, I’d say buy on condition not on miles. But do bear in mind it’ll impact resale.