Age calculation - TextBoxBase, DropDownList

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DateTime

actually i have one checked datetime picker,one textbox,one dropdown(years,months,days)

and my question is if user check the date timepicker textbox and dropdown both are shoud not available(disable) to enter
depend on date time picker auomatically age should be calculated and displayed in texbox (depend on dropdown(years or months or days) also)

if user uncheck the datetime picker user should available to enter age(textbox),and select years or months or days (dropdown) depend on dropdown and textbox text
date of birth(date time picker) should be show automatically


please tell me the answer if you know

thank you

[EDIT]Shouting removed![/EDIT]