What you do with the Selective Service Board kinda depends upon how old you are. If you are 18, 19, 20 or so you have to register and keep up your address or it could keep you from getting student loans. If you are over thirty not so much. Who knows who is even staffing these boards anymore. In small rural states like the Dakotas in the twentieth century you used to have the same old people staffing them forever. These people thought they owned you. I think that I quit worrying about them when I was in my thirties and I had completed two years in nonmilitary conscientious objector status. After I finished it in 1972, I kinda forgot about them, seeings as how I had put my time in. I was basically 27 years old.
From what I understand is that 18 year old males still have to register today or they can have problems getting student loans and maybe even driver's licences. Males need to be registered in their data base. If there is any follow up today, I have no way of knowing. I guess if you don't want anything from the government today and you have registered and they haven't bothered you yet, who knows. If you have had your gender legally changed to female who knows how that affects your selective service registration since they don't register females.
Now transgender males have issues if they have legally changed their gender identity to male do they have to register with their selective service board right after their gender is changed if they are still within military age?

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I am glad that I am 66 and way beyond dealing with this issue.