I cant download any app from my htc radar c110e

i have a htc radar c110e. first I could just go in my marketplace and download or install any app. but now if I try download any app it says "sorry you need to this from your computer because your account indicates that youre a child. to purchase content from marketplace go to zune.net or use the zune software on your PC and sign in with your windows live id" I dont even understand it and I dont even know what account is it talking about that indicated ima child...so I jus needed help with that:)
Asked Nov 25, 2013
I am a user of HTC radar c110e when I first bought the phone, the phone suggested I create a Microsoft account which will help me access marketplace and the rest, but when ever I want to download an app from the marketplace the phone will ask me to creat an account for marketplace and the rest but when I enter my details i.e my country and my birth date the will will be like I have reached the maximum number of accounts needed for a window phone but I have only one account on the phone that is the Microsoft account but yet keeps on showing that. Please help me out because I also want to download apps on my HTC radar 110e

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