Do planes "expire"?

Check this out:

"Paul Sterling of Sterling Aviation Technologies, Inc.
has FAA approval for his Wing Life Extension STC.
You can now get a minimum of 7650 additional hours past the 11k hour limit"

Found this on this site: http://www.pipertomahawk.com

(Yes i am looking into Tomahawks ... I am aware of the reputation they
have).

My question is, from this text it looks like planes... "expire". Once the
airframe is past a certain number of hours, that's it. They are toast.

You have kits to prolong their life (for the Tomahawk at least, as I have
seen) but ... what happens after the life goes past that threshold?

Do you "chuck the plane" in the trash?

Do you replace the wings? I can't even imagine how much that would cost.

I can't believe this... I was under the delusion that planes would last
forever... for some reason I find this ... "sad".


--
Marco Rispoli - NJ, USA / PP-ASEL
My On-line pilot community - http://www.thepilotlounge.com