It will work, it worked for my super old account I made during the Beta and finally decided to give the game a try after it became Free to play.
Also remember your account name is probably different to the name you chosen, I found that a bit confusing at first. KDStudios isn't my actual username for this account. That took some getting used to.
If you follow that link you can see what some other poor sap had to go through trying to get his fixed when the password reset hasn't an option or wasn't working as some others have mentioned. There is a number to call customer support at the bottom of that forum thread.