Rashi comments on the repetition of the word “shono” in the ages of both Soroh Braishis 23 (1) and Avrohom Braishis 25 (7). Why is there no comment for the age of Yishmoel which also repeats “shono” Braishis 25 (17).
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We find 4 ways in which the amount of years they lived are presented:
None of these have anything special that invites a question. You may ask why the change between days and years but we saw Rashi in Breshit 24:25 that days may mean a year.
Now the repetition of the word "years" following the units is a common way of saying it, maybe to teach us that the years of someone's life are not just a number.
I didn't actually look up these commentaries inside.
According to the Maharshal (cited in the Sifse Chachamim), Rashi does comment on the repetition of shana, though implicitly: it's because of the repetition of shana that we know to use the pasuk for the d'rasha that Rashi cites.
(I don't understand why the repetition of shana is necessary for that — why couldn't we make the d'rasha without the repetition of shana? — but that's what the Maharshal seems to be saying.)
The question remains why Rashi doesn't explicitly say he's commenting on the repetition of shana.