age differences

so theres this amazing wonderful boy i met 3 months ago and we’ve been official for about a month and a bit. he’s literally the best thing thats ever happened to me and i honestly love him so so so much. we’re very close and we talk about so many things that we haven’t told anyone else in our lives. he constantly tells me how much i mean to him and how much he loves me. we met online and where friends before we were anything else. i know hes legit, ive had phone calls with him and i have him on snapchat lol. the thing is hes 5 years older than me and im only 15 😬. i always have second thoughts about our relationship, age wise, but most of the time it isnt very significant to us, however, if we’re thinking logically, hes still 20 and im still 15. he says hes willing to wait until im legal and then we can be together properly. do you think this is a good idea?