Old Mask Seen It's Better Days

I have been using my Original Swift II nasal pillows for fifteen months now. Lately I have expierenced difficulty in getting a Good seal and have numerous leaks . I guess it has fullfilled it's Purpose and now time to get out the New Mask/pillows that I have had in storage. For other Swift II pillow users--- What is the life span of your pillows ? I think Mine are Just plain tuckered out. Not from over kill as I rarely wash mine---Maybe four times in the Fifteen months of use but I am satisfied from the lenght of use I got from them. Now if the new ones Last that long I will be Good to go.Tonight will be a New adventure for me with New Pillows.