Ashkenazic custom is to enwrap oneself in a prayer shawl just beginning from his wedding day. The practice is derived from the torah by a juxtaposition of verses saying 'to and' a man takes a wife. On the other hand, it is clear law, which was adopted with great affection by most Halachic decisors In Germany, rabbis spke against this custom and advised men, married and unmarried to certainly wear frills on any 4-cornered garment! Therefore in congregations following the german rite boys (unmarried) tend to wear the prayer shawl from the Bar Mitzvah.
Likewise the Sephardic custom is to wear the tallit from bar mitzvah or even earlier. In Yemeni communities it is customary to wrap shawl for purpose of education from an early age (age 5 or so). Yemen men traditionally wrapped themselves all day in Jewish prayer shawls every day. When outside their home they folded their tallit narrowly, so it lies on their shoulders while they went about in the city. In most communities this custom was replaced by wearing the tallit Katan under the shirt.
Please note: when adding special futures to the tallit, customization is made, custom products are created just for you therefore we cannot accept returns or refund.