ليت الشباب يعود يوما. شرح مائة المعاني والبيان

There's a similarity in the way it is pronounced and written 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
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ليت الشباب (فيلم)

Any idiom, proverb or piece of poetry suchlike? Asking for help, clarification, or responding to other answers.

idiom requests
Maybe as english speakers, you can't see it but in Arabic it's extremely colourful
idiom requests
The lyrics to the song goes like this
Traduction لَيْتَ الشَّبابُ يَعودُ en Français
To learn more, see our
"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
Gives it an extra spice Making statements based on opinion; back them up with references or personal experience

ليت الشباب (فيلم)

A certain song comes to my mind.

قاموس معاجم: معنى و شرح ليت الشباب يعود يوما فأخبره بما فعل المشيب في معجم عربي عربي أو قاموس عربي عربي وأفضل قواميس اللغة العربية
Please be sure to answer the question
ألا ليت الشباب يعود يومآ فأخبره بما فعل ____ من 6 حروف
The phrase goes back much further; see The Oxford Dictionary of Proverbs Cf
idiom requests
' 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