Depend on their use.
When I was on the road I could use tires that were 2 years old because I could wear them out in 50k-70k miles and 8-9 months.
Now if the tires are on a vehicle that sees maybe 3500 miles a year then I would want them 6 months or newer.
Or if the truck carried a heavy truck camper I would want them fresh also.
"good judgment comes from experience, and a lot of that comes from bad judgment" ............ Will Rogers
'03 2500 QC Dodge/Cummins HO 3.73 6 speed manual Jacobs Westach
'97 Park Avanue 28' 5er 11200 two slides