Just read a 1989 Calvin and Hobbes strip about Calvin being deliberately left home alone, unwisely, for a couple of hours. Calvin is 6.

The NSPCC says there is no set legal age and “while every child is different, we wouldn't recommend leaving a child under 12 years old home alone, particularly for longer periods of time.”

https://www.nspcc.org.uk/advice-for-families/home-alone/

How old were you when your parents first let you be at home alone?

8 or under
39.4%
9-10
27.9%
11-12
16.3%
13 or older, or they still won’t
16.3%
Poll ended at .
Staying home alone

Explore the NSPCC's expert advice on when and how to safely leave your child home alone, including legal guidelines, readiness indicators, and safety tips.

NSPCC
It was a March 1986 strip and this is what happens. In future strips, starting 15 May 1986, Calvin is babysat by Rosalyn. These two strips can probably be seen as establishing the Rosalyn stories. #calvinandhobbes
@Nickiquote I love the Rosalyn stories. They feel so real, she's a great character.