The 12x12s are probably 7-8 years old, the pavers in the second pic are about 4 years old, and the ones in the last pic are about 6 months old. I can only afford to pave in phases.
The main drive sees daily use by two of our trucks coming and going daily, and for several years, I parked my 1 ton dually in the same spot. I see no evidence of crumbling, settling, ruts, or voids in the pavers. I opted out of sealing them since my wife didn't like the wet look.
I don't recall how much sand my guy put in (2"?), but I personally put in 12" of compacted caliche over compacted native sandy loam. I initially did the compacting with a rented roller, but the majority came from driving on the caliche for a few years before we did pavers. It was almost like concrete at that point.
I've got a small area of the same pavers that have seen daily tractor crossings and vehicular traffic for 8 years now. Aside from tire marks, there's been no wear.