This photo is recent, not pre-Vatican II, what two things are notable about it?
Prior to the Second Vatican Council and prior to the sexual revolution of the 1960's there was an abundance of vocations to the priesthood and religious life. But there was also an abundance of children to be sent to the seminary, convent or monastery. It was not unusual for Catholic families to have four to ten children and no one thought it odd that so many children were born into Catholic families. Catholics were known for their big families.
Of course that would change with the advent of the "pill" that helped pave the way to the sexual revolution and sex that would be impotent.
Today, it is most rare for Catholics to have four or more children. Usually it is only two or three. And those Catholic who are profoundly fecund, are often mocked by the larger culture, including fellow Catholics, for having so many children.
As well the post Vatican II, spirit of Vatican II confusion and loss of Catholic identity as well as a profound loss of priestly identity and the identity of religious both externally and internally, hastened the shortage of vocations to the priesthood and religious life and exacerbated it. It will take another generation to fully recover from this malaise of identity.
However, if you go worldwide, you will see that vocations are being produced in abundance by intentional communities whether it be the charismatic covenant communities of the USA or around the world or the other new movements of Europe, such as the Neo-Cathecumenal way and even the "suspended" SSPX.
In Augusta, Georgia, the Alleluia Community which is a covenant community where most of their members live in the community of a single neighborhood and thus like the traditional parish of "ghetto" Catholicism of the northeast and elsewhere up until relatively recently and where traditional, conservative values and morals are taught and lived and accountability is a factor, there are vocations in abundance and out of the ordinary from this community. The Alleluia Community members also tend to have four and more children rather than just two or three.
Sadly though, what the Alleluia Community has contrived in their experience since the early 1970's was common place in most parishes up until the malaise of the 1960's that still afflicts most parishes today.
The Reform of the Reform in Continuity that is going to be Pope Benedict's XVI's legacy needs to re-examine Catholic life of the 1950's, especially parish life, and learn from it again the recipe to more vocations to the priesthood and religious life.
Of course the key factor in this recovery will be the recovery of a strong Catholic identity built upon traditional values of Sacred Scripture, Tradition and Natural law and a profound respect for little "t" traditions of faith, devotion and spirituality as well as exalting the place of canon law in one's life and community which leads to accountability and encouragement in leading the difficult Catholic life of picking up one's cross and following in the footsteps of Jesus Christ.