They are a 65,000 mile tire that you have 67,000 miles on, so I'd be pretty happy right there.
I also wouldn't feel safe ridding in a vehicle that only had 20psi in the tires, seeing as how most tire blow outs are caused by low pressure and the heat build up that happens because of to low of pressure.
Either way you make a good point that when tires are reaching the end of their design life that it is a good idea to inspect them for damage.
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