The main point I got from the OP was that mutton (meat from sheep over 2 years old) and lamb (meat from sheep younger than 1 year) have pretty different taste a

The main point I got from the OP was that mutton (meat from sheep over 2 years old) and lamb (meat from sheep younger than 1 year) have pretty different taste and other culinary qualities as meat. In particular, that mutton is much stronger flavored and tougher, lamb more tender and delicately flavored. Yet the comments section is full of people treating them interchangeably, replying to someone who talked about mutton by talking about lamb, or vice versa, or talking about "lamb/mutton". I'm not sure if the commentors disagree with the OP and think it's over-stating the difference? Or just aren't really paying attention. I (who live in the USA) have had plenty of lamb, but have never had mutton. So I can't say from personal experience. But this is one of those HN articles where the comments section seems entirely divorced from the article.