I would get a PPI done by a well recommended Indy and base a go or no go on the results rather than individual experiences. It could be that the things that tend to wear out prior to those miles have already been addressed.

If I were looking for a used X5 I would look for one at the top of my budget with the least miles that has the history of what was done/when and that has good PPI results. Depending on where I ended up I would look for a warranty to give me peace of mind for a year or two because even meeting the above it may not be what I*experience with that particular X5.

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas