I only NIP a handful of times after 2 with my oldest, and never needed to after 2.5. He wanted to nurse 24/7 so limiting it to at-home really helped. My middle child had a terrible distraction phase from 4-12 months, and as a result, would only nurse lying down from 4 months on. So, that limited NIP drastically! Plus, unlike my first, she wasn't a comfort nurser. She's still nursing at almost 6 years old - but still just lying down! My third child just turned 3 and still sometimes NIP. He would nurse all the time and is at 6-10 times as it is, so I try to limit it to at home unless we're out and about for more than 2-3 hours, then there's no reason for me to put it off.
I haven't noticed strange looks or anything. I've never had a single negative comment in all my years of NIP. (Though DD wouldn't NIP well, my boys did - and my boys both have huge heads and long torso's making them look even older in my lap). I live where NIP really isn't done - even for young babies but I guess I send out a vibe that it's normal!