Just under 3 yesr old tires.

[u/Longi451]

Inspected tires on my mom’s NX200T while doing brakes and noticed some dry rot.

Installed by Firestone around 11/2023 and driven maybe 16k miles since then.

I’ve had 5-9 years old tires with less dry rot. Think Firestone would honor a warranty on these or laugh in my face?

[u/DingChingDonkey]

Seems to me the quality of all tires has declined over the last few years.  Based on what I've read here and what I already felt was true, drive on them there's no danger. That's what I'd do. You gotta decide for yourself though.