Having heard stories of my homesteading great-grandparents being chased 'round and 'round their sod house by a steer while screaming at their significant other to "open the **ing door, for **'* sake!" I'm gonna stick with befriending crows.
(Cows give birth to steers, that's what not to like.)
I don't think his comment meant "edibility rises linearly with age." I think it meant "it reaches a peak" and implicitly "and then declines from there."
IMX cows (they are all domestic, locally) treat anyone with thumbs as a potential source of food.
They like licking hands and under-the-chin or cheek scritches; move slowly and talk, and if they're skeptical try crouching to make yourself smaller. (but don't make mothers suspect you're after their calves!)