You're not invisible! I can ask my OH what he wants for dinner and half an hour later he'll ask what's for dinner. It sounds like your life has been centered around your children and husband for a very long time and the responsibilities have taken over from you enjoying your lives as a couple. I'd bet your husband is also feeling a bit lost. Try suggesting doing something different (perhaps an activity you both enjoyed before the children came along), or maybe do something just for you - a supper club is a good start for meeting new people.
Good luck. There have been numerous similar posts from ladies whose children are getting to the age where they're independent so it certainly isn't just you.