My 1985 300D has a set of 4 Yokohama P195/70R-14 Avid Touring-S SL tires.
They were installed 5.5 years ago and have only 3,300 miles on them - I only drive the car about once a month and rarely on the freeway. The car is garaged. The tires lose about 2-3 psi every 6 months or so.

I plan to replace the rims this year (returning to originals) and am wondering whether it would be best for me to:
A. Simply dismount and remount the tires onto the new rims.
or
B. Replace the tires given their 5.5 year age.

Stated another way: Despite the quite low mileage on the tires, is 5.5 years such that they are physically degraded enough (even though tire pressures remain good) to call for replacement?

I would appreciate any advice on this (wasn't successful in finding much specifically in the archives on this subject).
Thank you.