To qualify, the child must be under 19, under 24 if a student or any age if disabled and must live with you for at least half of the year and receive at least half of their support from you. Dependent relatives who are not your children need to have gross incomes less than $3,800 and need to depend on you for half or more of their support.
The link that Christian shared is to work at Starbucks's in Greece. In the U.S. you have to be 16. The hiring age can vary according to the youth labor laws in the state that you work in. Source: I work there and was hired at age 17.
Starbucks workers receive medical insurance, a retirement plan and stock options if they work 20 or more hours per week. Lowe's workers with 40 hours or less get a dental plan, health plan, life insurance and short-term disability when they start. After a year, part-timers qualify for 40 hours of paid vacation time.