"si jeunesse savait, si vieillesse pouvait" meaning in French

{
  "etymology_templates": [
    {
      "args": {
        "1": "if 􂀿only􂁀 youth knew, if 􂀿only􂁀 old age could"
      },
      "expansion": "“if [only] youth knew, if [only] old age could”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "if 􂀿only􂁀 youth knew, if 􂀿only􂁀 old age could"
      },
      "expansion": "Literally, “if [only] youth knew, if [only] old age could”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “if [only] youth knew, if [only] old age could”.",
  "head_templates": [
    {
      "args": {},
      "expansion": "si jeunesse savait, si vieillesse pouvait",
      "name": "fr-proverb"
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  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "proverb",
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          "source": "w"
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          "source": "w"
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          "parents": [],
          "source": "w"
        },
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        }
      ],
      "glosses": [
        "youth is wasted on the young, you can't put an old head on young shoulders (it's too bad that young people lack the experience and wisdom which only come with age; at the same time, it's a pity that old people lack the physical wherewithal to take full advantage of their experience and wisdom)"
      ],
      "id": "en-si_jeunesse_savait,_si_vieillesse_pouvait-fr-proverb-8sJiFDEe",
      "links": [
        [
          "youth is wasted on the young",
          "youth is wasted on the young"
        ],
        [
          "you can't put an old head on young shoulders",
          "you can't put an old head on young shoulders"
        ],
        [
          "too bad",
          "too bad#English"
        ]
      ],
      "related": [
        {
          "word": "il faut que jeunesse se passe"
        }
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/si ʒœ.nɛs sa.vɛ | si vjɛ.jɛs pu.vɛ/"
    },
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  "word": "si jeunesse savait, si vieillesse pouvait"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "if 􂀿only􂁀 youth knew, if 􂀿only􂁀 old age could"
      },
      "expansion": "“if [only] youth knew, if [only] old age could”",
      "name": "m-g"
    },
    {
      "args": {
        "1": "if 􂀿only􂁀 youth knew, if 􂀿only􂁀 old age could"
      },
      "expansion": "Literally, “if [only] youth knew, if [only] old age could”",
      "name": "lit"
    }
  ],
  "etymology_text": "Literally, “if [only] youth knew, if [only] old age could”.",
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    {
      "args": {},
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      "name": "fr-proverb"
    }
  ],
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  "lang_code": "fr",
  "pos": "proverb",
  "related": [
    {
      "word": "il faut que jeunesse se passe"
    }
  ],
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      ],
      "glosses": [
        "youth is wasted on the young, you can't put an old head on young shoulders (it's too bad that young people lack the experience and wisdom which only come with age; at the same time, it's a pity that old people lack the physical wherewithal to take full advantage of their experience and wisdom)"
      ],
      "links": [
        [
          "youth is wasted on the young",
          "youth is wasted on the young"
        ],
        [
          "you can't put an old head on young shoulders",
          "you can't put an old head on young shoulders"
        ],
        [
          "too bad",
          "too bad#English"
        ]
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/si ʒœ.nɛs sa.vɛ | si vjɛ.jɛs pu.vɛ/"
    },
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    },
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  "word": "si jeunesse savait, si vieillesse pouvait"
}