Caution: Translations of Quran and Ḥadīth may lead to possible misapplications and misinterpretations. This site is intended for students of sacred knowledge that are proficient in comprehending classical Arabic and have a strong foundation in Islamic sciences. Also note that religious injunctions rely on several aspects beyond what one may glean through reading individual aḥādīth.
quran:78:33

And full-breasted ˹companions˺ of equal age  

and buxom maidens (kawā‘ib is the plural of kā‘ib) of equal age (atrāb is the plural of tirb),
القرآن:٧٨:٣٣

وَكَوَاعِبَ أَتْرَابًا  

{وكواعب} جواري تكعبت ثديهن جمع كاعب {أترابا} على سن واحد، جمع تِرب بكسر التاء وسكون الراء.

See similar narrations below:

Collected by Qurʾān
quran:56:37

Devoted ˹to their husbands˺ and of equal age,  

amorous (read ‘uruban or ‘urban, plural of ‘arūb, meaning ‘a woman passionately enamoured of her spouse’), of equal age (atrāb is the plural of tirb),
القرآن:٥٦:٣٧

عُرُبًا أَتْرَابًا  

{عرُْبا} بضم الراء وسكونها جمع عروب وهي المتحببة إلى زوجها عشقا له {أترابا} جمع ترب، أي مستويات في السن.