What kind of engineering? Designing what? How’s your local market for those positions? Is it something that can be done remotely, and thus you could apply to positions nationwide?
The really short version is that if you aren’t finding positions, you’re in the wrong line of work or location. If you’re finding positions and applying, but not getting any responses, then your resume/etc is bad. If you are getting responses but no offers, then your interview technique is bad.
What, specifically, are you concerned they might do, or might become? Are you afraid this might become a predatory sexual relationship? That he might become codependent? That the older guy is immature and will be a bad influence?
When you can define your concerns, it will reveal what action (if any) is appropriate.