Decaf cold brew is a bit of an oxymoron. As someone who can't have regular caffeine anymore, I wish it was possible because the other decaf iced coffee on property tastes so weak.
Same here- became overly sensitive to it as I got older. I make my own from Newman's Own decaf grounds and it is pretty great. But knowing DD & Starbucks don't do decaf cold brew, just asking before I travel.