I'm 4 years older than him

So I've finally hung out with this guy who's been showing interest for some time now . And after "hanging out" with him I think he's the bees knees buttttttt he's 4 years younger than me , well 3. But by how he acts and thinks you wouldn't even know he's the younger one . He treats me way better (so far)  than most the guys my age now . But I'm hesitant on letting more feeling develop because of this . Help I feel lost in my own feelings