''You will own a full and interactive profile Twitter account, not in an empty and clean account.''
We have:
Aged 2010 - 2014 accounts
Old Aged 2009 accounts
(Don't have 2008 and 2007 yet but will be soon)
Every day Twitter always filters inactive accounts, and among them every day thousands of "clean" accounts with no profile or less interaction are permanently locked, a typical example is that if you buy 10 empty and clean accounts, 90% of them will be permanently locked or asked for a phone number after you log in.
That's why you should choose an Aged account that is fully interactive and profiled for your work.