Nope. ID says he joined March 2002. Almost 21 years... This "new" math is tough.2 - 3 years
My thoughts are, if there is any chance of water in the cylinders, I would make it a very high priority! It won't take long for water on those unprotected cylinder walls to make a mess out of a good engine! Even if it has been a while since the roof collapsed, it might make a difference to shorten the time by as much as possible.I'll be opening this can of worms when I get a free weekend and will give you a report on what I find.
John.C.