now that they're young again, why not make another kid? usually, old people got a lot of savings right, so no prob on the financial front for them right?
Page 2 - I've always get surprised by Jii-sama -> I always get surprised by Jii-sama
I've prepared some red rice in secret -> I prepared some red rice in secret
Page 3 - I won't do that my grankid -> I won't do that to my grandkid
There are other mistakes too but they're only minor.
@HanabiMao Maybe the hourglass was a reset, not just a switch. Meaning that they won't suddenly revert to their old selves, but will instead age another 60 years.