I went through it, at only a couple years younger than you. Tell only the people who need to know. Those you interact with daily who you love and who need to understand your behavior. You got by this long without explaining, and probably pulled off the eccentricity thing well so far, so no need to change it now.
I told my immediate family and over time a few close friends. That's all. I do not want to be treated like I'm five years old which is what I'm afraid will happen if I tell others.
I'm a very competent housewife and mother of four. I cook, clean, chauffer, am the house nurse for the sick, bake bread, plan meals, do the shopping, pay the bills, mediate the arguments, etc, almost exactly as an NT would. I'm just eccentric about certain things. Thats all.
I also live in the Deep South where by a certain age (ours) you should have some eccentricities anyway, so it's fine now.
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I'm giving it another shot. We will see.
My forum is still there and everyone is welcome to come join as well. There is a private women only subforum there if anyone is interested. Also, there is no CAPTCHA.

The link to the forum is
http://www.rightplanet.proboards.com