by Elizabeth Chorney-Booth for Avenue Magazine – Calgary Ages: 36 (Lorin); 38 (Daniel); 33 (Barry) Job titles: Farmers, ranchers and owners of Gemstone Grass Fed Beef Why they’re 2023 Top 40 Under 40s: The fourth-generation ranchers have innovated their family business while raising beef that Calgarians can feel proud to eat. Brothers Daniel, Lorin and Barry Doerksen grew up on…