What does "good old days" mean?

A period of time in the distant past when things were better or fondly remembered.

What is a synonym for "good old days"?

Common synonyms include: auld langsyne, heyday, lang syne, langsyne, old times.

noun

noun ·Rare ·Advanced level

Noun

1
A period of time in the distant past when things were better or fondly remembered. plural, plural-only
"In the good old days we could go to the gasworks and buy coke."
2
past times remembered with nostalgia wordnet

"In the good old days we could go to the gasworks and buy coke."

Blend of good old + old days.