NO!   They are still perfect and maybe check back in another 25 years'.
The PR, VS* and TC series were released over 40 years' ago and are STILL in full production today!   We've been the Australian distributor for almost all that time and we have 35 year old 4PR and 8TC cables as demo cables.  When the dielectric is stripped off the copper wire inside is still PERFECT!  Zero tarnishing, zero damage and the Ultraplate Bananas look brand new with zero loss of spring.
Of course you may wish to upgrade to a higher performance model and you WILL get a noticeable improvement in sound quality.  If you do, then pass on your treasured cables to a family member or friend.  (I'm not implying that family members are not friends, so no cheeky emails please).  They can get another 25 years out of them and will always remember who gave them the wonderful gift.
* In 2023, Kimber upgraded the PR series to have the same spec as VS.  So PR "merged" with VS, keeping the PR model name.