I've got 38 special cases that are so old the headstamp is almost smooth. They still keep shooting. I really don't think there is any "age" of pistol brass that matters as long as you are loading sane, normal, published loads that are within the design of the caliber. At worst a case splits and you toss that brass piece in the scrap bucket. It's not like a rifle with 2x to 3x the pressure where a failed case can be dangerous.
I scrap brass for pistols for split cases when picking them up, or they get so dinged up in the rim they are potentially unreliable for extraction- with only a taper crimp they don't get the mouth worked so much to harden it and get brittle. By way of comparison, revolver brass goes until it gets mouth splits, usually from working the roll crimp, or just cracks down the side spontaneously.