I'm in the same boat, only 56. I am the youngest and only girl with 3 older brothers.

How much does your mom call you? I would work on evening out contact so you contact her about as often as she does you? Let her initiate contact a bit and see where that goes; I think she'll tell you if she would like to hear from you more/less? That way you don't have to worry about her and can concentrate on you.