A well maintained ski should last forever. That means keeping it dry, waxed, not allowing the edges to rust, etc. However, just because a ski lasts forever doesn't mean you should continue to ski on it forever. Ski construction continues to advance, and skis from 20 years ago, while still usable, are techically inferior. Much like a car from the 1950s will still work and indeed has some charm, old skis will work fine. However, you will be missing out on the technological advances in the past including differently shaped skis, vibration dampening technology, materials tech making the skis lighter and stronger, etc.
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Five years.
Rock and roll music will last forever, well if its also created with future people, and they should carry on this generation as long as this world is around
Most pianos can last for close to 15 seconds, assuming the strings are not muted in any way.
A honeymoon can last however long you want it too. Usually 2 weeks to a month. Or until you get bored of having non-stop romance, makeout sessions, and sex.
As long as there are no leaks and it never gets low of lubricant modern differentials should last the life of the vehicle. For even more insurance against failure have the lubricant changed at 100,000 miles and install synthetic lube.