Xbox Tenure

[Mojo]

so, i'm trying to sell my main which I KNOW has 1+ year tenure, but when I go to the profile, because it is silver, it does not show a tenure. Can anyone assist me in figuring out how to find the tenure of a silver acc?
Thanks in advance,
-Mojo

 

[Tactical]

There was a link where you got 1 free month of xbl. And when you get it it shows your tenure since it turns your account into gold. I'll try to find the link now bro.

 

[cas]

so, i'm trying to sell my main which I KNOW has 1+ year tenure, but when I go to the profile, because it is silver, it does not show a tenure. Can anyone assist me in figuring out how to find the tenure of a silver acc?
Thanks in advance,
-Mojo

Xbox site, checking billing or something and it'll show the the past monthly payments for gold.