I was searching for recent anime ARs when I came across one from an upcoming Crayon Shin-Chan movie.
https://www.youtube.com/watch?v=cr7O0oWI0jY
The movie is named
Crayon Shin-chan: Invasion!! Alien Shiriri, and will release on April 15th. Its synopsis is that an alien named Shiriri comes to Earth, and Shin-chan's parents get basked in Shiriri's laser. This makes them 25 years younger, which means Hiroshi (the father) becomes 10 and Misae (the mother) becomes only four. To change them back, they need to find Shiriri's father.
I expected it to be poof and humorously change their clothes into diapers, but it actually does have mild process and baggy clothes, to my pleasant surprise. The AR is briefly seen in the trailer, but it doubt it'll be longer in the actual movie; still, wait and see. The movie does look funny and cute, I'm eager to see more of it!
(As a side note, I hope that Shin-chan's parents won't be the only victims of this deaging ray. ^u^)