The first menstruation can be as young as 9. In the US the average age for girls to start menstruating is 12.
A girl can start her menstrual cycle from when she is about 9 years old any where through to when she is 16 years old.
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When they are around the age of 13 they get there period or menstrual cycle. You can get this from 9 through to 17. If you don't have it by the time your 17 go see your doctor or ask your mum about what time she got her period.
Female, Age 9. From China
You don't ovulate on the last day or the day after the last day of your menstrual cycle.The last day of your menstrual cycle is the day before your period - the first day of your period is day one of your menstrual cycle. Ovulation occurs two weeks before menstruation, if you had a 28 day cycle that would mean you would ovulate around day 14 of your menstrual cycle.Unless you use fertility awareness method you can't tell when you are fertile or ovulating.
Orangutans reproduce sexually, with males seeking out females for mating. Female orangutans have a menstrual cycle and are only receptive to mating during certain periods. After mating, the female will gestate for around 8-9 months before giving birth to a single offspring.
You have no control over when your first menstrual period occurs, and extremely limited ways to influence the cycle (aside from pregnancy).
The answer is yes, but for only part of the heat cycle will a female is receptive to breeding. On average, this phase (called the estrus phase) begins around day 9 or 10 from the initial onset of the cycle. It is only at this point in the cycle when a female will allow and even encourage mating.
Female dogs typically reach sexual maturity and can become pregnant around six to twelve months of age, depending on the breed. It's important to prevent unwanted pregnancies before this age by spaying or closely monitoring your dog during heat cycles.
The best bet to avoid accidental pregnancy, pyometria, and several types of cancer is to have your female spayed BEFORE her first heat cycle. This usually occurs between 7-9 months of age.
It differs among girls, but it usually starts around 12 or 13