Because unfortunately, tech people equate old with bad. Meanwhile, old can also mean the bugs have been worked out, doesn't change too drastically, and it's re

Because unfortunately, tech people equate old with bad. Meanwhile, old can also mean the bugs have been worked out, doesn't change too drastically, and it's relatively stable. jQuery gets the job done and has a low barrier of entry. Worry less about what people think about a tool, and use the best tool for the job (even if you get flack for it). You'll win in the long run. When they're having to refactor their codebase, you're skirting by the wayside with reduced maintenance time and costs.