Using older cable in new system? Need advice...

Hi,

I'm in the process of refreshing a system that I originally bought in the mid to late 1980's and need some cabling advice.

I sold my Vandersteen 2C's on Audiogon and will likely replace them with either Quad 21L's or Totem Arro's. I have a SOTA Sapphire (currently being refurbished at SOTA) for analog and just purchased a Music Hall 25.2 CD player for digital. My amp is a PS Audio Elite Plus integrated with 70 watts/channel. I also have a Tandberg tuner.

My 20-year-old speaker cables are Monster Cable Powerline 2, which was "pretty good stuff" back in the day. Should I keep on using it? Is this something that deteriorates over time? Also, in my new, much smaller listening room, the lengths are way, way longer than I need... would I want to have this cabling resized at a dealer?

Thanks for any and all enlightenment you can offer!

Peace!