I just use leather care products to make sure it doesn't wear too bad. Yes, it'll show signs eventually, but I'd rather have a solid 6-7 years of beautiful beige interior in the meantime. Even when it does age it'll just give the car more distinction.
As for jeans, the only jeans I wear don't stain, so not worried about that. Even if you do get some stains, some cleaning products get it right out.
Then again, my last car only had 40k miles in 10 years, so I'm not overly concerned about wear =P