import type { AgeResult, I18nStrings } from './types.js';
/**
 * Calculate post-menstrual age in days.
 * PMA = gestational age at birth (in days) + chronological age (in days)
 */
export declare function postMenstrualAgeDays(chronologicalDays: number, gestationalAgeWeeks: number): number;
/**
 * Calculate age in days between two dates (ignoring time-of-day).
 * Uses UTC to avoid timezone/DST issues.
 */
export declare function ageInDays(dateOfBirth: Date, dateOfMeasurement: Date): number;
/**
 * Calculate corrected age for premature infants.
 * Correction = (40 - gestationalAgeWeeks) * 7 days
 * Applied only when chronological age < 2 years (731 days).
 */
export declare function correctedAgeInDays(chronologicalDays: number, gestationalAgeWeeks?: number): number;
/**
 * Format age as a human-readable string.
 * - < 1 month: days only
 * - < 2 years: months and days
 * - >= 2 years: years and months
 */
export declare function formatAge(days: number, strings: I18nStrings['age']): string;
/**
 * Calculate full age information including prematurity correction.
 */
export declare function calculateAge(dateOfBirth: Date, dateOfMeasurement: Date, gestationalAgeWeeks: number | undefined, strings: I18nStrings['age']): AgeResult;
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