I've conditioned once or twice in my 21 months of ownership. Leather at this particular spot (lateral support of driver's seat) is starting to show the forewarnings of cracking (the wrinkles in your picture are pretty similar to mine). I have this on my Volvo V70 with beige leather seats, at the same spot (it's a 2011 car)!
I think there is just a lot of deformation of this particular part of the seat in all car seats: as you sit down this part is supposed to give you lateral support, it does so by being squeezed outwards from the weight of you in the seat and hence squeezes back, but this comes at the cost of a lot of stress to the lateral surface. I noticed for some reason it's not the same toward the center of the car even though the seat look pretty symmetrical. Perhaps it's because you ingress and egress through the door which is laterally? And as you sit down and get out you put extra stress on the lateral part of the seat with your entire weight (almost).
I would also be interested to know if people that are bigger and heavier have more of this!?!
Edit: sorry, saw now the the pic in the OP showed to bolster in the seatback, not the seat cushion. But it's the same principle (lateral support) and mine also shows a bit of wear here, but in my car the seat lateral bolster is worse.
Here's my Volvo seat for reference: