From which age to which age is systolic blood pressure typically 90?

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The correct age range during which systolic blood pressure typically reaches 90 mmHg is from three months to four years. During this developmental period, children undergo significant physiological changes as their bodies grow and mature.

In infants and young children, the normal range of systolic blood pressure is lower than in adults. As they grow, their blood vessels become more elastic and their cardiovascular systems become more efficient, which contributes to the gradual increase in blood pressure. By the time children reach three months, they typically have a systolic blood pressure that approaches 90 mmHg, which is considered within normal limits for this age group.

The other age ranges do not accurately reflect when systolic blood pressure reaches this point. For instance, the ranges for six months to two years, one year to three years, and five to ten years either do not align with the typical progression of blood pressure in early childhood or extend into an age where blood pressure standards have already shifted higher as a child continues to grow. Thus, option B accurately captures the developmental stage where a systolic pressure of 90 mmHg is typical.

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