The Mishnah Says: Mazkirin yetziyath Mitzrayim ba’layloth.
We Mention the Exodus from Egypt at night.
Rabbi Elazar ben Azarya said: “I am like a seventy year old man and yet I did not merit that the Exodus from Egypt must be mentioned at night until Ben Zoma explained (darsha) the verse: ‘In order that you remember the day you left the Land of Egypt all the days of your life.’ ‘The days of your life’ [would mean only] the days, [the addition of the word] ‘all the days of your life’ [indicates that it includes] the nights. And Chachamim (the Sages) say that: ‘‘The days of your life’ [would mean only] this world, ‘all the days of your life’ [is written] to include the Days of Mashiach. (Mishnah Brachot 1, 5)
Rabbi Elazar ben Azarya said: “I am like a seventy year old man […].
“The Gemara (28a) relates, this was the result of a miracle which occurred to him. The Sages wished to appoint Rabbi Elazar ben Azarya president of the Sanhedrin at the youthful age of eighteen ([…]). His wife advised him not to accept the position, for it was unbefitting for a man of his youth to expound in front of the Sages. A miracle occurred and his hair turned white, giving him the distinguished appearance of a man seventy years old.” Yad Avraham Berachoth, Pages 90-91. Mishnayoth Seder Zeraim, Vol. I.