Boat looks good and seems to be well taken care of. No idea on life span of an inflatable..fyi I paid 3k for my boat; engine and trailer....
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Can't remember or find any years; but PVC tubes are bad (5 year life), polyurethane (PU) tubes last 10-15, but can be armored to resist knife and bullet puncture, Hyperlon is thicker and considered to be stronger and more durable. Zodiac has licenced a number of manufacturers worldwide, and owns Avon, so it is likely there are Zodiacs of all three materials.
Zodiac Strongan is a PU, Strongan Duplex came out in '05 ('cause Stongan wasn't good enough?). Their Stongan tubes are machine heat welded at the seam, while Hyperlon is hand glued. There are pros and cons to both processes, but a properly sealed Hyperlon will last longer as far as I can find, and it can be patched easier.