Puberty at Age 14: Normal Variation and When to Consult a Doctor

Puberty onset varies widely. Age 14 is within the normal range for both sexes, though toward the later end for girls.

Typical Age Ranges

• Girls: Thelarche (breast buds) 8–13 years (avg 10). Menarche ~2–2.5 years later (avg 12.5). Range 10–16 years.
• Boys: Testicular enlargement (>4 mL) 9–14 years (avg 11.5). Peak height velocity ~2 years later. Range 11–17 years.

Constitutional Delay of Growth and Puberty (CDGP)

Most common cause of "late" puberty. Family history (parent/sibling late bloomer). Normal growth velocity, bone age delayed. Spontaneously progresses. Reassurance, monitoring.

Red Flags for Pathologic Delay (See Pediatric Endocrinologist)

• Girls: No breast development by 13, no menarche by 15 (or 5 years after thelarche).
• Boys: No testicular enlargement by 14.
• Both: Growth velocity <4 cm/year, arrested puberty, signs of malnutrition/eating disorder, chronic illness, anosmia (Kallmann), genital ambiguity, neurological symptoms.

Evaluation

• Bone age X-ray (left hand/wrist).
• Hormones: LH, FSH, estradiol/testosterone, TSH, prolactin, IGF-1.
• Karyotype (Turner 45,X in girls; Klinefelter 47,XXY in boys).
• Brain MRI if central (low LH/FSH) + neurologic signs.

Support

Normalize variation. Address body image, bullying, psychosocial stress. Gender-affirming care if gender-diverse. Resources: pediatrician, school counselor, therapist, support groups.