In the 1960s the number of Jesuits in the world reached a peak at around 36,000; four decades later that number stood at just under 20,000. Most of the numeric decline has occurred in western Europe and in North America. In some other parts of the world, numbers have risen, and in the post-colonial era the average age of Jesuits in certain places is startlingly young when compared with that in France or Italy or the USA. India now is home to the largest group of Jesuits, a distinction that belonged for a while to the USA, and before that to various European countries. The Society of Jesus has always been international in theory and practice: a Jesuit without a passport hardly seems worthy of the company founded by Ignatius of Loyola. But how that international character is lived out has changed a great deal since 1540. And how Jesuits work with or alongside others has changed as well. Collaboration with a wide variety of people, women and men, only a few of them clerics or members of religious orders, has become the norm for Jesuit activities, in ways unimagined even a half-century ago. But adaptation to circumstances and to particular cultures in particular times and places - so central to the Jesuit way of proceeding in the sixteenth to eighteenth centuries - remains at the heart of how the Society of Jesus does whatever it does. Ignatius of Loyola wrote thousands of letters, many sent by sailing ship to Jesuits in far-flung places around the globe. Today, in a culture sustained by jet travel and instantaneous electronic communication, Jesuits make abundant use of the most advanced transportation and communication technology. For example, Irish Jesuits sponsor Sacred Space, an online, multilingual service inviting computer users to ten minutes of prayer.