Final answer:
The first menstrual cycle, or menarche, typically occurs around 12 or 13 years of age in females.
Step-by-step explanation:
The first menstrual cycle, also known as menarche, typically occurs around 12 or 13 years of age in females. However, there is considerable variation among individuals where it may occur as early as 8 years of age or as late as 16 years of age and still be considered normal. The average age of menarche in the United States is 12.4 years, but it can vary due to genetic and environmental factors.