Pope St. John Paul II commented on St. Louis de Montfort's writing about the End Times:
"St. Louis-Marie contemplates this eschatological dimension (concerning the final times), especially when he speaks of the 'saints of the last times' formed by the Virgin in order to bring about in the Church the victory of Christ over the forces of evil (cf. Treatise on True Devotion, no. 49-59).
This is not in any way a form of "millenarianism", but the profound sense of the eschatological character of the Church, linked to the uniqueness and salvific universality of Jesus Christ. The Church awaits the glorious coming of Jesus at the end of time.
Like Mary and with Mary, the saints are in the Church and for the Church, to make her holiness shine forth, to extend to the ends of the earth and to the end of time the work of Christ, the only Savior." (John Paul II, Letter to Montfortian Families, § 8).
It is in this context that the expression "Age of Mary" must be interpreted: "When will come that happy time and that age of Mary, when many souls chosen and obtained from the Most High by Mary, losing themselves in the abyss of her interior, will become living copies of Mary, to love and glorify Jesus Christ? " (TD 217)
This " Age of Mary " is a time when, on the one hand, Mary will have made herself known (she bursts forth in mercy, strength and grace) and on the other hand, a certain number of Christians will enter deeply into "true devotion" to Mary and will glorify Jesus Christ.
Françoise Breynaert
Marian Encyclopedia
Abbreviation: TD: Saint Louis-Marie de Montfort, Treatise on True Devotion