FiftyPlus

I can only affirm Arrows answer. As long as you give the other person to chose the real you, then it is ok and it is possible. Hiding things from a partner, whatever that might be, will not be healthy for a relationship. And if that secret gets discovered the necessary trust is gone. So, if you know your orientation let your potential partner know.

I really can relate to your problem. My advice is, to be sincere. It might come out sooner or later and if it is later, it will eat you up inside in the meantime and be much more hurtful to your partner then. Perhaps they will be fine with this situation. Then you would have suffered for nothing all the time. Perhaps they will not be ok with it, then you give them the chance to use that time to build a relationship they can really relate to. I am over 50, married for 30 years and I always knew that I don't love my husband as much as he loves me. I could never say "I love you" without knowing that it is not true. I do care for him. He is my partner for life. Still I have no romantic feelings for him. I didn't know better, as it is only lately that I found out, that I am not a cold hearted person, that nothing is wrong with me but it would destroy him if I told him the truth now. And this is killing me. So, if you already know about being aromantic, be honest. Trust is the basis of a good relationship.