I am a new instructor. A challenge I face is some students that are a bit older than me tend to look down to me. In other words, I get looks like "How would you know. Your young enough to be my son". This usually happens when I make a suggestion in improving some hands-on skills. If I see they are doing something wrong or could be improved, I step in to help them without them asking for help. I feel they would rather struggle than to take instructions from someone younger then them.