Shaykh Saalih Al-Fawzaan (may Allaah preserve him ) was asked:
Q. Does the right of the son, to provisions and residency over the father, end when the son merely reaches puberty or when he gets married?
A. "The rights of the son, over his father, ends with the mere state of being independent of him. When he gets older and has the ability to earn for himself and be independent (from his father) with his earnings, then the right of receiving provisions from his father comes to an end as long as he is still young, or even older. However, if he's not independent of his father and he doesn't have the capability to earn, then the right remains upon his father to spend upon him until he is able to be independent of him. That is by way of the obligation of family ties."
Source: Silsilah Fataawaa Al-Mar-ah al-Muslimah "Tarbiyyah al-Awlaad Birrul-Waalidayn" pg. 21
Sisters Upon Al-Istiqaamah