Is it permissible for young men and young women to gather in the obedience of Allaah, I mean to agree to visit orphanages and old people’s home, and each of the young men and young women gather separately and meet at orphanages and old people’s home to help the sick and be friendly and play with the children?

All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad is His slave and Messenger. We ask Allaah to exalt his mention as well as that of his family and all his companions.

If the situation is as you described in the question, then there is no harm in this, provided that the young women wear Hijab and do not mix with men, while men should have their own separate activity and women should have their own as well. In addition to this, this work should not be a means of discussions and meetings in which women speak in a soft tender voice or other things that result from forbidden mixing. For more benefit, please refer to Fatwa 87469.  

Allaah Knows best.