He’s 23, five years later he will be 28, a good age for a guy to get married. It’s not too late, so his family shouldn’t have an objection, unless they object to you. I think you are planning far too ahead at 18. This guy is probably your first love. How can you be sure, he’s The One? I have a theory. There are two sets of people. There are those who have their share of affairs before they get married and then settle down. Have affairs. Then there are others who marry the first guy who comes along and get married, and years later wonder if they made right decision. They, then have affairs to see what they’re missed. So be very sure before you decide this is the guy for you. Also, don’t make him wait for five years and then tell him that your parents are against the match. But if you know this is your happily-ever-after guy, then tell your parents about your plans now. Also, let him and his parents meet them, So there are no issues later on. All the best.