It must be hard to watch individuals that are younger and not as experienced than you moving ahead while you are stuck in the job considered the toilet seat of the building It must hurt to have them tell you what to do, to hear them yell at you when you do stupid things (things we all know you aren't smart enough to know are stupid.) And it must keep you up at night knowing a person you once mentored can now "U" rte you.
You are stuck on this middle rung of the ladder. You can't go up, but if you are not careful, you will hit the ground. Many will be happy to see this happen.