What do you mean? If you have started your account, it is still there... If you wonder whether your BTS are still available after years of absence, yes it is. You only need your keys, and/or user name and password to get back on track and start using your funds. :) As soon as you get back on it, the value of the BTS will be where it is at at the moment of login into the network, like right now. ;)
All for one and one for all! Namaste :)