English summary: This is the final volume in the critical edition of Petrarchs letters. This volume, Seniles, or letters of old age, was posthumously prepared by his disciples based on an unfinished manuscript. As in previous volumes, the critical edition of the Latin text is accompanied by a French translation and scholarly commentary. French description: Avec ce volume, l'edition des Seniles, les lettres ou le grand humaniste, au soir de sa vie,...