"Most cattle don’t get past the age of two. American beef comes mostly from steers and heifers slaughtered between 18 and 24 months old." https://www.texasmonthly.com/bbq/old-cows-texas-steaks-heartbrand/#:~:text=Most%20cattle%20don't%20get,%2C%20red%20meat%E2%80%94the%20better.

Maybe just stop breeding more of them??

Yea what you described sums up the "stop doing stuff" part well. But you really gotta follow it up with a statement about how its good for the environment else you might come off a little aggressive.

And the meat thing will solve itself after you and everyone else stops doing stuff. Cuz it's only a temporary problem of having lots of meat for a bit but after it rots and goes back to the earth the earth is healed and without people doing the stuff to make more animals there won't be any of those bad animals that make burps and farts and meat so the meat thing you only have to worry about once. But as long as we didn't do the stuff that makes the animals it's ok cuz then if the animals still exist and burp and fart it's ok because it wasn't caused by stuff we did, it was caused by stuff the animals did and as long as we didn't cause the animals, the animals are part of nature and good for the environment.