Wilson Watt Puppy 5 - cone/tweater lifespan?

Ive heard of WP5's at like 10+ years old needing to be reconed (replacing the soft surround around the woofers) as well as having tweaters replaced. Is this normal, and how much does it cost to have Wilson do this? Thinking of buying a set of WP5's, want to know what im getting myself into. Thks.
This is a no brainer & very east to ascertain... just call Wilson at (801) 377-2233