If they are crack free and you drive only on dry roads, they should be fine. I wouldn't use those old tires on wet pavement. In eight years the rubber probably has hardened some and wet traction will suffer.Had the tires on my 17 Regal GS rotated and balanced, tires were mounted sometime in 2016 as originals, tires are Pirelli P Zero 255/35/20's. Should they be replaced or hang on for a couple of more years, still look new with only 25K.
P ZERO™ 255/35R20 | Pirelli
255/35R20 - P Zero: The expression of Pirelli tire technology in the Ultra High-Performance segment for cars and SUVs. Buy now!www.pirelli.com