They do not yell anymore. Whenever they're angry, they simply speak with conviction. The other always understands.
They do not drink anymore. Instead they have tea three times a day-once in the afternoon, then the evening, then at night.
They do not dance anymore. They tell stories and sit by fires. They pluck instruments and decide to make music instead.
They do not rule anymore. Sharper minds are now in place for that. They spend their time traveling and greeting old friends.
They do not fight anymore. They express their passion in other ways, such as through their elements and through riveting conversations.
At night they still hold each other close. This shall never change despite the years.
Zuko and Katara have grown old together and life has granted them peace.