Monitor Longevity

[Fat Dog]

Had my LP2475w for a while now. Calibrate it every 2 weeks. Each time the RGB settings and brightness change, always the the same way. When new, it was around 225/225/255 and brightness 25. Now it's more like 190/210/255 and 35. Just wondering what the useful life of a monitor is before it becomes impossible to calibrate it correctly?

 

[Fat Dog]

At a guess I'd say it's coming up to 2 years old. Presume the HP is classed as a 'higher quality monitor' given it's an IPS screen.

Just hoping it lasts plenty longer as really like it.