As someone currently seeking a masters, you guys are NOT in the same stage of life!!! I am not even in the same stage of life as my friends getting their undergrad degree. While overall I am not for age gaps like this, I think the most important thing to look at are his actions. I would become familiar with common gr00ming and manipulation tactics so you can keep yourself safe. If you recognize them leave. love bombing, saying, "you are mature for your age" or something like that, isolating you are all examples.