I have a rule of thumb I use with tires. Will they last 5 years? After 5 years, tires are basically at the end of practical life from aging and will start dry rotting/cracking or just start getting super hard.
Just for example, if I was a middle aged doctor that bought a Harley so I could polish it every weekend and only put 1000 miles a year on my bike, almost any crappy tire would do because there is no point in buying some super high end, expensive, touring tire designed to go 10,000 miles if I will only put half that on them in that 5 year window.