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.
Rating Newest Oldest. Best Answer: No one can say exactly when a girl will get her first menstrual period, but usually girls will get it some time during puberty. Some girls start puberty at age 9 or 10 where others may start as late as age 15 or 16.Each girl goes at her own pace.ating Newest Oldest. Best Answer: No one can say exactly when a girl will get her first menstrual period, but usually girls will get it some time during puberty. Some girls start puberty at age 9 or 10 where others may start as late as age 15 or 16. Each girl goes at her own pace.