jquery date picker

I have the date picker that will select a date of birth. When selection is made I need disable some of the options on the dropdown. To be more specific, When I am selecting the DOB I am calculating the age of the person, Now if the DOB is 15 years    and 9  month I need to disable some of the drop down options.

function calcage() {
				var vdob = new Date(document.getElementById("dateofbirth").value);
				
				var vcurrentTime = new Date();
				var vyear = vcurrentTime.getFullYear();
				var vyear1 = vdob.getFullYear();
				var vage = vyear-vyear1
				var vcurrage = vcurrentTime.getTime() - vdob.getTime();
				vcurrage = Math.floor(vcurrage / (1000 * 60 * 60 * 24 * 365.25));
				document.getElementById("age").value=vcurrage+' years';
	}

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erikTsomikSystem Architect, CF programmer Asked:
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leakim971PluritechnicianCommented:
           document.getElementById("age").value=vcurrage+' years'; // your current line 10
           if(vcurrage<15) {
               $("#dropdown1").hide();
               $("#dropdown2").hide();
           }
           else if(vcurrage>=15 && vcurrage<30) {
               $("#dropdown1").show();
               $("#dropdown2").hide();
           }
           else {
               $("#dropdown1").show();
               $("#dropdown2").show();
           }
}

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erikTsomikSystem Architect, CF programmer Author Commented:
well What I need is to make sure that if the user 15 years and 9 month old (this condition is critical).
leakim971PluritechnicianCommented:
function calcage() {
     var vdob = new Date(document.getElementById("dateofbirth").value);
     var today = new Date();
     var year = today.getFullYear() - vdob.getFullYear();
     var month = today.getMonth() - vdob.getMonth();
     var notYet = month<0;
     year = notYet?(year-1):year;
     month = notYet?(12-month):month;
     if(year<15||(year==15&&month<=9)) { // if less than 15 years and 9 month old
               // hide dropdown
               $("#dropdown1").hide();
               $("#dropdown2").hide();
           }     
}

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erikTsomikSystem Architect, CF programmer Author Commented:
I tried but the formula does not. FOr example the persons birthday is on 3/24/1999 so today he is exactly 15 years 9 month old, if I shift the date to 3/25/1998 then it is still shows me 15 years and 6 month event though his 15 years and 9 month will be tomorrow
leakim971PluritechnicianCommented:
3/24/1999 => 15y6m not 9m
erikTsomikSystem Architect, CF programmer Author Commented:
I am just testing a different case scenario if the rule is 15 years and 6 month
leakim971PluritechnicianCommented:
so what ? the function give you year and mont, you do what you want with on line 9

if(year<15||(year==15&&month<=6)) { // if less than 15 years and 6 month old
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