Leather wear can depend on a lot of different factors. Mileage, maintenance, weather/storage conditions, size/weight of user/clothing type (or driver in this case).
Mileage- obviously mileage will take a toll on leather over time, there is no way around that but high mileage does not automatically mean the seats will be shot as others have stated. I have seen the same trend with other Lexus/Toyota products. I am currently in the market for a later model year LS430 and have seen the same thing as with this LC, some 200k+ vehicles have brand new looking leather and others with 50-100k miles have leather that looks extremely wrinkly, squished, and just shot.
Maintenance- Although Lexus and Toyota all have "coated" leather these days and most likely since the early 90's you can still help preserve the leather by simple maintenance such as the famous Leatherique system where you condition the leather first to loosen all the dirt by applying the rejuvenator and giving it time to work than using the pristine clean to wipe off all the loose dirt and finishing off with a damp towel to remove any chemical residue. Leatherique works best on older uncoated leather because it can actually soak through the material, but as thousands of others have found out it works awesome on newer leathers also.
Weather conditions- A truck that sits outside in the sun all day will have much drier and more cracked leather than a truck that is stored in a garage or underground parking lot. If you're in the south especially, the interiors won't hold up as much. Toyota did a better job with their interiors back in the 90's and early 00's but if you do a quick Google search for most Lexus and Toyota products after around 2005 you'll see the alarming trend of cracked/sticky/and melting dashboards and other vinyl surfaces. This is due to extreme heat and cheap manufacturing.
Size and user weight/clothing type - This one is HUGE. From what I have seen this will be a major factor in prematurely wearing out seats, much more so than mileage. Large trucks and cars will generally attract bigger and heavier drivers and with that extra weight you will naturally see premature wear on leather seats, no way about it. The LX I bought was driven by a small lady its entire life for over 115k miles and the seats look nearly brand new. Some of the other trucks I have seen with less mileage were in much more "used" condition. Clothing type also has a big effect on leather wear. If you're wearing blue jeans all the time or any type of jeans/abrasive clothing, be prepared do deal with the consequences.