A sentimental or nostalgic reference to times gone by which are considered better or more pleasant.

पुराने सुनहरे दिन

English Usage: I miss the good old days when we used to play outside all day.

Hindi Usage: मुझे पुराने अच्छे दिन याद आते हैं जब हम सारा दिन बाहर खेलते थे।