lisääntymisikä

Lisääntymisikä refers to the period in an organism's life during which it is capable of reproduction. In humans, this typically begins with puberty, when reproductive organs mature and hormonal changes allow for the production of eggs and sperm. The end of the reproductive lifespan is marked by menopause in women, where ovarian function ceases, and a gradual decline in fertility for men, although men can often remain fertile much later in life.

The specific age ranges for the onset and end of the reproductive period can vary significantly between individuals due to genetic, environmental, and lifestyle factors. Puberty generally starts between the ages of 8 and 13 for girls and 10 and 14 for boys in many Western populations. Menopause typically occurs between the ages of 45 and 55.

Understanding reproductive age is important in various contexts, including human biology, demography, and public health. It influences family planning, reproductive health discussions, and research into fertility and aging. Societal norms and cultural practices can also play a role in how reproductive age is perceived and utilized within different communities.