"Let's go outside!" Marie rummaged around in a dresser drawer and pulled out a couple of Mary's T-shirts. "We can wear these."
After pulling on shirts, they headed out to play. Mikey held back long enough to grab a couple of the vial. Maybe they could have some fun.
There weren't any kids outside - it was a school day, they remembered, and it would be hours before anyone close their new age would show up. Instead they started playing catch with an old ball. Marie threw it as hard as she could, and it went flying over the fence.
"You got quite an arm there, little lady." An older man came around the fence fro the other side and tossed her the ball back, smiling. Haven't seen you two around before. Are you related to Mary?"
"Uh, yeah. Yes, sir." Marie looked at Mikey, who nodded. "We're visiting. She's our aunt."
"Say, would you play catch with us?" Mikey grinned. "It's sort boring being by ourselves."
"Sure. Just take it easy on an Old Man." He came over, limping a little. "I'm John Denton. You can call me John." He was maybe in his late 60s, thin and frail looking. But he had a friendly smile, and spent the next half-hour tossing the ball for the kids. After a while, he started to get winded. "Sorry, kids. I gotta rest a minute."
Mikey looked at the vials he had, and then grinned. "Just a second! I''ll bring you something cold to drink!" He ran in the house, fixed a glass of ice water, and poured a bit from one of the vials. Then he ran out and handed it to John. "Here! This will make you feel better."
John smiled, though he was still tired, and took the glass. "This is really nice. Thanks." He sipped some of the water, then drank more. The white hair on top of his head started to darken, and lines in his face began top smooth out. "You know, I do feel a lot better!" He downed the last of the water, already back in his 40s, and handed the glass to Mikey. "I haven't felt this good..." He was 30 now, and regressing fast, and his voice sounded different. "That's weird..." He glanced down at his 20 year-old hands and gasped. "What's happening?" His voice cracked as he dropped below 16, his clothes falling loosely on his rapidly shrinking body.
Mike waited until the change was over, and grinned at the now-ten-year-old Johnny. He had a tangled mop of dark hair, lots of freckles, and buck teeth. Stunned, he looked down at himself. His shirt hung on him like a huge bathrobe, and everything else was crumpled on the ground. "I'm a kid!"
Marie laughed. "Yeah, you can really play with us now!"