welcome to the forum. I understand how it feels to be so alone even with people around you. I struggle with friendships. You are not invisible, not too old for friendship, and there is lots of room for you. Maybe you need a purpose beyond being a wife and mother -- an activity or group or cause you can be a part of to fill some of the emptiness and a common interest to build friendships. When I was part of a group that met weekly, it helped create a number of friendships for me. Also, online friendships can help.