You need to be 18 to be married but he could be lying he could be like 20 we don't know and if your not ready for a relationship then don't accept we could ask them more questions to check if he is 16 but a 5 age gap not sure if that okay actually you can't be together she is a toddler and your a teenager so sorry warlord you can't be her boyfriend if you do become her boyfriend then you may go to jail for what ever it is called