The first, smallest, and only odd prime gap is 1 between the only even prime number, 2, and the first odd prime, 3. All other prime gaps are even. There is only one pair of gaps between three consecutive odd natural numbers for which all are prime. These gaps are g2 and g3 between the primes 3, 5, and 7.
Girls usually start their periods between the ages of 10 and 16. Most girls start when they're around 12. As everyone develops at different rates, there's no right or wrong age for a girl to start. Your periods will start when your body is ready, and there's nothing you can do to make them start sooner or later. If you haven't started your periods by the time you're 16, visit your doctor for a check-up.
Girls. 1  Puberty will probably start for you between the ages of 8 and 13. 2  You will most likely get your period (a.k.a menstruation) between the ages of 8 and 16. 3  You could wear leak-proof period panties that are comfortable and breathable. 4  Don't get scared and freak out. 5  When you get your period, you will feel awkward. Usually, that means that your voice will become deeper. 2  You will see hair begin to appear under your arms, around your groin, and on your face, and hair on your arms, legs, and other areas of your body will become thicker and heavier. 3  Your penis and your testes will grow larger.