How can you find out when a yahoo email address was activated?

I have a yahoo email address and I need to know the date it was activated. Where could I find that out? I do not have the password, just the email address.

How can you find out when a yahoo email address was activated?
you can't
Reply:u can't find. bt u can see the last updation of that account by using yahoo messanger and see the profile of taht account