Being terrified of people who are smarter, wiser, more competent that you is not a healthy reaction. The world is not a hunger games (at least, not yet), so someone being better than you is not an immediate threat to you. However, the writer seems to be a self-centered and hyperambitious kind of person, in which case someone else's success can be seen as a diminishment of one's own accomplishments ("How am I going to climb to the very top if there are some many older people who are better than me?"). But that's obviously unhinged.

There's a good chance this guy will cringe hard once he rereads this post in 10-20 years.