Interactive
Body Changes Explorer
Pick a body and slide to an age to see which changes are typical right now. Every body runs on its own schedule — this shows common ranges, not deadlines.
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Ranges reflect typical timing described by pediatric organizations. Signs before age 8 (girls) or 9 (boys), or no signs by 13 (girls) or 14 (boys), are worth discussing with a doctor — see our early or late puberty guide.