Wally is older than a 50+ year old man, but thanks to his powers his aging has slowed down. He's still in great shape, though. A familiar smile crosses his lips as Alex asks him that question.
"You already know who I am, son." Wally says with a tip of his hat, "But the last time you saw me, I hadn't shaved in a while and I was in a wheelchair."
The woman behind Alex places a slender hand on his shoulder, smiling softly and her voice familiar and kind, "It's us, Alex. Your parents, we're back."
Alex's mother is in her 70's and looks it, but still healthy and vibrant. Wally himself looks younger but that should be obvious by now as for the reasons why, "We came back, Alex. We're both here to stay. If you'll have us?"