Stig's pretty much nailed it.
Unless you go the local route and have 'em in your hand you'll get whatever was on top of the pile at the warehouse they drop ship from. Simply a matter of cost. Having someone dig through the pile to get a couple months newer would take a lot of time/money.
I've bought a few sets of tires from Revzilla in the last year or so. All of 'em were less than a year old. I suspect they drop-ship from the same place Bike Bandit does as well.
They have a great return policy and will happily answer any questions ya have.
My two bits, learn to read the codes on the side if ya don't know how. The interwebs has that info.
Order a set, & if it's within a year, smile and install. Over two years, & ya don't ride much. Maybe return 'em, but if you do, & they're in good shape ride 'em since you'll probably wear 'em out before any age issues creep in.
"Fresh" tires are great, but there's no substitution for keeping an eye on 'em. I've seen a fresh set of less than a year old dunlops that showed cracking, & ridden out a 7 year old set that was fine. Also replaced the 7 year old set on my burger, that still had notable tread left, right after I bought it since they were visibly decaying.