Tough meat does come from old/worked cows, but braising is not the only way to tenderize tough cuts. The connective tissue can also be mechanically (cut in small pieces across the grain, or by using machines that use tons of needles to cut fibers apart) and chemically broken (Acids & enzymes).
“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Tough meat does come from old/worked cows, but braising is not the only way to tenderize tough cuts.
The connective tissue can also be mechanically (cut in small pieces across the grain, or by using machines that use tons of needles to cut fibers apart) and chemically broken (Acids & enzymes).