Aaronic priesthood (LDS Church)

The Aaronic priesthood (/ɛərˈɒnɪk/; also called the priesthood of Aaron or the Levitical priesthood) is the lesser of the two (or sometimes three) orders of priesthood recognized in the Latter Day Saint movement. The others are the Melchizedek priesthood and the rarely recognized Patriarchal priesthood. Unlike the Melchizedek priesthood, which is modeled after the authority of Jesus and the Twelve Apostles, or the Patriarchal priesthood, which is modeled after the authority of Abraham, the Aaronic priesthood is modeled after the priesthood of Aaron the Levite, the first high priest of the Hebrews, and his descendents. The Aaronic priesthood is thought to be a lesser or preparatory priesthood and an "appendage" of the more powerful Melchizedek priesthood.

In The Church of Jesus Christ of Latter-day Saints (LDS Church) today, the holders of the Aaronic priesthood are primarily young men ages 12 to 18 and recent adult male converts to the church. The general leadership of the Aaronic priesthood, called the Presiding Bishopric, are administrative and financial agents of the church. Local leaders of the Aaronic priesthood are adult male bishops, who serve as pastoral leaders of individual congregations. Aaronic priesthood holders generally prepare, bless, and administer the sacrament, collect fast offerings, perform church and community service, assist in home teaching, and occasionally perform baptisms. In their priesthood activities, holders of the Aaronic priesthood are also supported by the church's Young Men organization.

...
Wikipedia