Ffs! Ok so a clutch is a bad example my point being that a car with 100k nonwithstanding the 'bullet proof' engine has other parts that are going to be worn after 100k.....if your buying on a budget and looming at high milers just to be wary of this fact.
There are bushes, arms, bearings, gearboxes, clutches, hoses and other assorted crap that arre not going to last forever (like the engine can) and can still mount up to a whole sack of cash.