Do you have a reference for this by chance? Concerning the life of the "shocks?"
I have replaced all four of my 'shocks.' On the front, the bushings wore out and allowed the shock shaft to wear through, causing a leak. Replaced both front shocks around 150k miles.
On the rear, one of of the shaft seals started leaking/weeping despite pressures being in spec. Replaced both rears at 175k miles.
Both of these issues caused my truck to regularly 'pump up' after being parked for a bit, which was my first indication something wasn't quite right.
I have new OEM globes ready to install should it become an issue, but as of right now, the globes are in great shape.
As always, YMMV.