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The grass is always greener [on the other side [of the fence]] is used when someone thinks that the place they are at is worse than some other place, but is not actually. Or when a person thinks someone else is better off, but actually isn't.

Is there a similar expression, but about "good old days"? Like when someone thinks that "the grass was greener" 30 years ago?

3

To quote a long ago commentator, nostalgia ain't what it used to be.

2

Those were the days!

TFD(idioms):

Those were the days!
something that you say which means life was better at the time in the past that you are talking about
We had no money but we were young and madly in love. Oh, those were the days!

Cambridge Idioms Dictionary, 2nd ed. Copyright © Cambridge University Press 2006. Reproduced with permission.

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