My grandpa has been getting senile,

so he barely remembers anything nowadays.

All he remembers is stuff from long ago,

so when it's over 30 degrees in the summer he starts thinking it's abnormal weather.

Ooh... That does sound like what a Shouwa-era person would think.

Right up until about the beginning of spring, when I was training at home,

he started telling me "Don't drink water while exercising!"...

I heard that's how people used to think, yeah.

But when summer came around he got mad at me and said "Drink some water, you'll kill yourself!"

He updated his knowledge on his own...!

Nowadays he noticed "Plain water isn't enough,"

so he always reminds me to get a daily intake of sodium too.

For advancing his knowledge despite his age, your grandpa's pretty cool.