Look at it this way. In addition to the rigging being 10+ years old, as you stated, the owners lost interest in the boat. Which means that a good while back, they totally
lost interest in doing any upkeep on the boat, including & especially the rig. As rig work is expensive.
Also, while 10 years is the average figure, you don't really know the boat's history
. And rigging generally rots fron the inside out. Meaning that it can look fine, but literally hanging on by a thread.
Plus, it's just a fact, that headstays wear out a good bit quicker than other stays & shrouds when the boat has a furler
. You can read on some of the why, starting here & scrolling down Loose Shrouds
So, as has already been said, you'll need to budget for swapping out all of the standing rigging. Plus, a full rigging inspection. Meaning; tube, tangs, fasteners, chainplates, sheaves, boom, reefing system, blocks & attachments, wiring
& conduits, running rigging, lights & antenas, etc., etc.
Basically, everything which would see zero attention from a disinterested owner.
So, have a rigger (with good references) look things over, & see about getting a ballpark quote from him as part of that. Then use it as a negotiating tool as part of buying
the boat. Otherwise, you could wind
up with a $4-digit headache.