Great question.
Here are a few VERY general guidelines. Of course, longevity of products can be impacted by how well things are maintained, etc. Generally, you take good care of your stuff and it will take good care of you.
The two largest expenses on a Florida home is the roof and the A/C system. Roof life is contingent on the slope of the roof, the color, and if trees are over them, etc.
An average roof in Florida "should" last 15-18 years. Cost of course is up to how big your roof is. They do NOT do re-roofs here, and a reroof is never a good idea anyway.
Your A/C system "should" last 12-15 years.....perhaps longer with GOOD maintenance and service with cleanings 1-2 times a year. A new system can easily cost $5,000 to $7,000....perhaps more if you buy a higher SEER rated A/C system.
Water heaters usually last (in The Villages) 15-20 years. Of course, almost no one does annual maintenance on them like the manufacturer's recommend. A Plumber replacing one can cost towards $800-$1,000.
Garage door springs usually start breaking at the 10 year mark. One should always replace them in pairs. This is generally NOT a DIY project. I usually recommend Ryan O'Cull for this. It is not the dumbest idea to do this sometime after the ten year mark, as I personally would rather be pro-active than reactive and replace things on MY schedule instead of when fate decides. Too often these things happen on holidays or when you are out of state....
So it is easy to see that it is wise to budget a few thousand a year for such things so one is prepared and not adversely affected by replacement costs.
Most other things mentioned here are cosmetic things....and that is of course up to your personal taste.
Hope this helps.... Frank D.
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Florida licensed Home Inspector #HI688. (352) 250-7818
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