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Love does not seem to be affected by the age gap. Just let him know and see how he reacts. if he is also in love, there is no problem.

Hi,there! It's not a big deal these days that you love sb who is younger than you.Actually it's not that uncommon nowadays.I have seen many couples like that.So don't be afraid or anxious.The age is not the problem.The point is that whether you guys really love each other and fit each other:) Well,if you feel shy to tell him,then you can give him some hints.But if you're not shy,you can tell him bravely.After that,you can see what's going on.I just wish you good luck! Best regards and have a nice day^_^

I think if you really love him, you should told him the truth.