A new and useful method is provided, for enhancing the immune system of a donor/recipient. Stem cells are collected from the donor/recipient at a time that the donor/recipient appears to have a healthy immune system, taking into consideration the age of the donor/recipient and the characteristics of a healthy immune system for a donor/recipient of that age. The stem cells are processed and stored in a condition that enables the stem cells to be later administered to that donor/recipient in predetermined amounts, in serial (consecutive) fashion, over predetermined time intervals, and at the later request of the donor/recipient, the stem cells are administered to the donor/recipient in serial (consecutive) fashion, over predetermined time intervals, to enhance the donor/recipient's immune system thereby preventing formation of age related diseases that are caused by rundown immune system. The practice of the present invention results in replenishing the hematopoietic system and primarily rebuilding the immune system in an aged individual. Also noteworthy, it refreshes the repertoire of stem cells, which are at the point of exhaustion, bringing about extension of life span and can also be used for improvement of cognitive functions of the donor/recipient.La présente invention concerne un nouveau procédé utile destiné à renforcer le système immunitaire d'un donneur/receveur. Des cellules souches sont recueillies auprès du donneur/receveur à un moment où le donneur/receveur semble présenter un système immunitaire sain, en prenant en considération l'âge du donneur/receveur et les caractéristiques d'un système immunitaire sain pour un donneur/receveur de cet âge. Les cellules souches sont traitées et stockées dans un état qui leur permet ensuite d'être administrées au donneur/receveur dans des quantités prédéterminées, en série (de manière consécutive), à des intervalles de temps prédéfinis, et à la demande ultérieure du donneur/receveur lesdites cellules souches sont admi
