When Jewish children reach 13 years old for boys and 12 years old for girls they become responsible for their actions, and "become a Bar or Bat Mitzvah" (English: Daughter (Bat) or Son (Bar) of the commandment) and are called to the Bima to read from the Torah.
Calling someone to say the Torah blessings during a service is called an Aliyah (from the Hebrew: עֲלִיָּה, from the verb la'alot, לעלות, meaning, "to rise, to ascend; to go up"). The widespread practice is that on the Shabbat one or more days after their 13th birthday, and may recite the blessings for the Torah reading. Also read the week's portion from the Torah (five books of Moses) and Haftara (selections from the books of the Prophets), give a d'var Torah which may include a discussion of that week's Torah portion, or both. they may also lead part or all of the morning prayer services.