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Asking for help, clarification, or responding to other answers The lyrics to the song goes like this

كلمات اغنية الزمان

And it causes them to yearn for the time which was wasted.

idiom requests
A certain song comes to my mind
ألا ليت الشباب يعود يومآ فأخبره بما فعل ____ من 6 حروف
Any idiom, proverb or piece of poetry suchlike? ' I just want to note that it's so eloquent in Arabic and so colourful because youthness is Shabab meaning the youth and grayness is Masheeb
شرح مائة المعاني والبيان
Maybe as english speakers, you can't see it but in Arabic it's extremely colourful
"God, tell us the reason, why youth is wasted on the young" Clearly implies the young do not know the value of what they have until much later in life There's a similarity in the way it is pronounced and written
To learn more, see our May not be as descriptive a prose as you expected

ألا ليت الشباب يعود يومآ فأخبره بما فعل ____ من 6 حروف

Making statements based on opinion; back them up with references or personal experience.

29
فيا ليت الشباب يعود يوماً
The phrase goes back much further; see The Oxford Dictionary of Proverbs Cf
ألا ليت الشباب يعود يومآ فأخبره بما فعل ____ من 6 حروف
Provide details and share your research! The question asks for an idiom via the idiom-requests tag and your suggestion is hardly idiomatic, and indeed introduces "tenuously" which is not in the original at all
idiom requests