Generally speaking, the younger a person undergoes the LASIK (or other refractive surgery) procedure, the more they are going to get out of it. It is a simple time-related thing. At some point in the future (usually in the 60s and 70s), a person will get cataract and undergo cataract surgery. This is the point where you could say that the effects of LASIK have 'fully depreciated', ie that it serves no particular purpose anymore since cataract surgery can also correct spectacle power by itself.
Bear in mind, however, that in general it is advised that people wait until the early twenties before having LASIK because the spectacle power tends to stabilise by then. The youngest age where a person could have LASIK is 18, provided the spectacle power has not changed in the past year, but most people wait until the early twenties.
As you can see, the early twenties is probably better than the late 20s or 30s, irrespective of whether contact lenses cause progressively drier eyes.
Of course, this does not mean there is nothing to be gained from getting LASIK later on. It can still provide significant benefits - eg convenience of spectacle free clear vision, but the older you get, the more you may have to think of other things like presbyopia as well-especially when you get to your late 30s and forties.
