Read and reflect on verse 499 from Surah An-Nisaa: And test the orphans [in your charge] until they reach a marriageable age; then, if you find them to be mature of mind, hand over to them their posse...
وَابْتَلُوا الْيَتَامَىٰ حَتَّىٰ إِذَا بَلَغُوا النِّكَاحَ فَإِنْ آنَسْتُمْ مِنْهُمْ رُشْدًا فَادْفَعُوا إِلَيْهِمْ أَمْوَالَهُمْ ۖ وَلَا تَأْكُلُوهَا إِسْرَافًا وَبِدَارًا أَنْ يَكْبَرُوا ۚ وَمَنْ كَانَ غَنِيًّا فَلْيَسْتَعْفِفْ ۖ وَمَنْ كَانَ فَقِيرًا فَلْيَأْكُلْ بِالْمَعْرُوفِ ۚ فَإِذَا دَفَعْتُمْ إِلَيْهِمْ أَمْوَالَهُمْ فَأَشْهِدُوا عَلَيْهِمْ ۚ وَكَفَىٰ بِاللَّهِ حَسِيبًا
And test the orphans [in your charge] until they reach a marriageable age; then, if you find them to be mature of mind, hand over to them their possessions; and do not consume them by wasteful spending, and in haste, ere they grow up. And let him who is rich abstain entirely [from his ward's property]; and let him who is poor partake thereof in a fair manner. And when you hand over to them their possessions, let there be witnesses on their behalf - although none can take count as God does.