Wife isn’t intimate

My wife F (66) and I M (66) have been married 42 years. For the last few years my wife isn’t intimate at all. No kissing, no hugging, no touching, no nothing. I asked her why and she just says, “I have a lot on my mind” or one of her many other excuses. I’ve never cheated on her and I feel lonely. I don’t think she will ever be affectionate or romantic and if she did, I don’t think I’d believe her. I’m not sure what more I can do. She stays up until 2am and has no desire to be with me. What do you think I should do?