The Greek noun hēlikia (ἡλικία) means age, time of life, stature, bodily maturity. It appears eight times in the NT (Matt 6:27; Luke 2:52; 12:25; 19:3; John 9:21, 23; Eph 4:13; Heb 11:11). The word can refer to physical height, chronological age, or the span of one's life, depending on context.
In Luke 2:52, Jesus 'increased in wisdom and in hēlikia' — here meaning age/stature, describing his genuine human development. In Matthew 6:27 and Luke 12:25, Jesus asks: 'Which of you by being anxious can add a single hour to his hēlikia?' — here most likely 'span of life,' since anxiety cannot extend our days. In John 9:21, the parents of the man born blind deflect: 'He is of hēlikia' — he is of legal age, old enough to speak for himself. Most theologically rich is Ephesians 4:13, where the church is to grow 'to the measure of the hēlikia of the fullness of Christ' — full spiritual maturity measured against Christ Himself.