^^^ Yes, check for weather checking and cracking on sidewall and between treads. I've used older than five year old tires with no issues BUT there is a risk of catastrophic failure... what are you willing to risk? The tread depth doesn't look that great but I just bought a used set of tires, 1/4" tread depth, mounted and balanced for $C200.00 from a tire shop. That didn't include rims. I'd offer 100 and go from there.
Good luck,
Richard