Can an exceptionally mature 19-year-old man date a 42-year-old woman if both share common interests and love for personal development?

Sure, why not?

Hell, an exceptionally immature 19-year-old-man can date a 42-year-old-woman even if they didn’t share any common interests and had no love for personal development. What, silly and goofy people aren’t allowed to date each other?

There’s no minimum level of seriousness and “maturity” that adults have to demonstrate to be worthwhile partners to each other. As long as they’re adults, they get to set the rules, not outside observers.

The way you’ve phrased the question makes dating seem like a particularly grueling job interview or daunting admissions test for loving adult partnership. Quite frankly, the kind of dating you’re describing sounds boring as hell and dull as dirt.

Adults that like funny, fun-loving, spontaneous, and jovial partners (think childlike, not childish) don’t have to pass a seriousness exam to get with each other.