* The country: Labor laws vary significantly across the globe. Some countries have minimum working ages that are much higher than others.
* The type of work: Some jobs might have age restrictions even above the minimum working age.
* The definition of "full-time": What constitutes full-time hours also varies by location and employer.
In many developed countries, the minimum age for full-time employment is 16 or 18, but even then, there might be restrictions on the types of work allowed for those younger than 18. In some places, working full-time before age 16 is illegal.
To find the specific legal age for a particular location, one would need to research the labor laws of that country or region.