Liquid Template variable assign issues

Hello Friends,
My basic objective is to set Entity Form on the portal page dynamically based on the users age, If user is above 19 I have to show Entity Form 'A' and if user is under 19 Entity Form 'B' will be showed.

And I'm working on the approach that through web template I will render entity form dynamically and here it is my code on the web template:

{% extends 'Layout 1 Column' %}

{% block main %}

<script> var age = "{{user.birthdate}}";

var condition = '';

var date = age.substring(0,age.indexOf(" "));

var start = new Date(date),

end = new Date(),

diff = new Date(end - start),

days = diff/1000/60/60/24;

var actualdays = parseInt(days,10);

alert(actualdays);

if(actualdays > 6935) { condition='true'; {% assign userage = 'Form A' %}

alert("{{userage}}"); }

else { condition='false'; {% assign userage = 'Form B' %}}

</script>

<div class="container">{% entityform name: userage %}</div>

{% endblock %}

But every time the form 'A' is rendering on the portal even though the userage value showing correctly on alert. Please help on this issue.

Thanks.

Muhammad Ebad