I do not want to show pre select age variant as the Default.

[chandamamastore]

how can i do User/Customer can manually select the Age variant not to show  initially select age variant.

[Guleria]

Hello @chandamamastore ,

I don't think you can do it yourself. 
btw if you know code or if you have a developer ask him to deselect the default value on product page when customer reaches there.
Also you have to make sure the add to cart button shows an alert message if a customer forgot to add the product without selecting the variant.  

Thanks