Greetings. First look at the manufacture date on the tire, it will appear with a 4 number code. Yours could read like this (being a 2018 model year) 5018 which would mean they were produced the 50th week of 2018. Normally tires can run for 5 years before replacement. How have they been stored? Hopefully out of the sun, if you observe a lot of cracks in the sidewalls I would replace. If they appear more like tires on your vehicle with no weather checking I would keep them.
Important thing here and you are being proactive is to maintain proper tire pressure. If they are a load range "C" than you want them at 50 psi cold. If load range "D" then 65 psi cold.
We have gone through 2 sets of tires over the past 10 years, both were load range "C" on our 177 and both sets were made in China. 34,000+ miles and kept at 50 psi - no issues or problems. Just changed out to our 3rd set a month ago to Carlisle "D" and looking forward to using these great performing tires.
Congratulations on your 179!