Yes, gather enough gold on 1 character (or multiple characters on the same realm) and once you have used up all the game time that came with the expansion, then you will be eligible to start using gold to purchase Tokens to use for game time.
The gold cannot be stored in a guild bank or the Warband Bank. It must be in a character’s personal inventory.
More info about how to use the Token system for game time can be found here: