Whilst it is good to have some common ground, I don’t think an interest in historic aviation is a make/break in a relationship. If anything if you meet the right person they will want to get more involved in your hobbies and interests, and you in theres. Conversely you need a bit of a safe haven to retreat into if necessary. For example, my partner is pretty knowledgeable about historic aviation and comes with me to airshows. She has other interests as do I, so we don’t rely on this one shared thing to keep the relationship rolling along.