I have a 2004 X5 3.0i currently @ about 108k miles. I think what he meant is after 100k miles, more uncommon parts need to be replaced. Everything tends to wear down with age, but thats doesn't mean its falling apart. Just be aware that some repairs can get a bit pricey in the later stages of a cars life.

Proper care and maintenance will keep your car running smoothly. I'm still happy with the overall drive of my x5. There are a few suspension parts that need to be replaced, but its nothing surprising considering the abuse its been taking for the term of its life.