From Hidaya Foundation:
The person should be Muslim, adult, sane, free (not a slave).
They must posses a certain minimum amount of extra wealth (called nisab), fully owned by them in excess of personal use (such as clothing, food, shelter, household furniture, utensils, cars, etc).
They should have had this minimum amount in possession for a complete lunar year (hawl). The wealth should be of a productive nature, from which they can derive profit or benefit such as merchandise for business, gold, silver, livestock, etc.
The minimum amount (or Nisab) should not be owed to someone, i.e., it should be free from debt.
The above states that a Muslim has to be an adult to give zakat.
Question: At what age does a person become an adult in Islam?
What specific age in Sharia law does anda person become an adult so they are obligated to give zakat?
(Please include evidence from Qu'ran or Ahadith)(Please include evidence from Qu'ran or Ahadith)