Well.... I've reached that age.
I'm 43 (almost 44) and my eyes are now at +2/-.5
My current mask is a Mares Liquid skin and it fits like a glove. It's probably the best mask I've ever had. I'm loathe to dump it but I can't read my gauges!
My mask is done for and it needs to be replaced.
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Keep your mask. I have corrective lenses in my Mares X-vision. I assume you have the same if you have Liquid skin. All of the X-visions have the same size lense anyway. I got mine thru my LDS with Aquatic Optics but I'm sure you could get it cheaper direct. They may even be able to send the lenses to you without having the mask. I have an astigmatism and just got progressive glasses so I may need to update my own mask soon. It ain't cheap though. In the $160 - $200 range (single vision) I expect depending on how much shipping you have to do.
http://www.prescriptiondivemasks.com - Prescription Dive Masks 1-800-538-2878. or
http://www.newportglass.com/aqucat.htm - aquatic optics