CPAP Issues experienced by long-term user

I am 63 years old and have used a CPAP machine for approximately 20 years and suddenly experiencing difficulty with my RESMED Airsense 10 Machine and nasal mask that are limiting my sleep to two hours at a clip only. I use a RESMED Airlift N20 and have been experiencing severe difficulty getting the nose piece to get a proper seal. I had suspected that this was an issue with the quality of the plastic they use which after just a few uses becomes overly soft and collapses during use requiring me to over tighten and loosen the mask over and over to get the correct fit. Additionally, the EPR setting on my machine was normally set to 3 does not seem to be getting me to that comfortable breathing rhythm that I have been accustomed to achieving previously. last night I change the EPR from 3 to 2 which allowed me to get some sleep but not sure the problem is resolved. Has anyone experienced issues with the Airsens 10 EPR or pressure settings or with substandard nose pieces that may be contributing to my current issues? I am extremely fatigued and nNeed to fix this quickly so I can get a full night sleep.

Faces change as we age, I'm also a 20 year user and have experienced needing to change masks after having used them for a long time. Since you are using a nasal mask you might consider looking at one that has less area to seal, like an N30 or N30i for example. The less area the mask is in contact with your face the less it's likely to leak. Pillows are even better, they are by far the easiest to seal, at least for me. If you've used a nasal mask this long you're not a mouth breather so pillows or a minimal nasal mask might be a good option. I've done really well with P30i (with a hose hanger).

As for the breathing. When you reduce the EPR on a Resmed it has the same effect as raising the minimum pressure. I need a fair amount of minimum pressure to feel like I can breathe, and the minimum is higher now than when I was younger. You might try increasing the minimum pressure a little at a time to see if it's more comfortable.