All four in their old age (rubberglue)
Children in Capes - A, G, M, M (I'm assuming that's the four you mean) - G
"Being old sucks," Morgana complains. It's her birthday, and she's not exactly enjoying the celebratory dinner.
"What?" Arthur asks, looking up from his meal.
"Being old sucks," she repeats, louder.
"Too right," Arthur agrees. "This pork is terrible," he declares.
"That's because it's chicken, Love," Gwen says, brushing his silvered hair from his forehead and kissing it as she returns to the table.
"Honestly, is this what you lot expected? It's like… in my head, I'm still 23. I hobble around this drafty old castle, wondering who all these… children are who are playing dress-up in the knights' cloaks."
Arthur snorts. "A few of them are my children."
"Grandchildren," Gwen corrects.
"Really?"
"Yes. Elyan and Bradford are 17 now," Gwen says, referring to their oldest grandsons, twin boys.
"Still oblivious," Merlin snorts from the other end of the table. "Maybe more so, now that you're ancient."
"Shut up, Merlin," Arthur attempts to growl. It comes out more of a wheeze. "You're just as old as I am. And I am still king, you know."
"And I haven't been your servant for fifty years. Or have you forgotten that as well?"
"My memory is still quite sound!" he blusters.
"Mmm-hmm. Like yesterday, when you almost walked out of your chambers without your shoes?"
"I was… testing you. Seeing if you were paying attention."
"Right," Merlin nods slowly. Then he notices Arthur staring. "What?" Merlin asks.
"It just hit me. That aging spell you used to do was remarkably accurate."