Life is too short. And I am not trying to be funny by the way! It is, it is simply too short to live with someone who is not fulfilling your needs. Ya know! It sounds like the two of you are with each other for companionship and there is nothing wrong with that. Friends with benefits is what you need to tell her you want. And all that goes with it.
I know lots of people stay together for a multitude of reasons, but if you dont feel loved, what is the benefit.
Well, I don't think being a senior has anything to do with it, to be honest. Some relationships just aren't that great. You say that you two aren't enjoying one another's company much anymore, there is a lack of affection that you desire, and poor communication. If you were younger, would you leave her? I do think that when we want a partner to act a certain way, we act that way first and they follow suit. But it sounds like you've tried this. So, I guess you have to decide if staying in this relationship is worth it at the risk of not finding anyone else. (which you probably will!) good luck (and no matter how old you are, you deserve to be happy.)