exchange visa or volunteer permit


I am 25 years old  french student. I am looking for internship opportunities in South Africa and I have been offering a position in SA. This position is unpaid so I will  undertake non remunerative activities. To apply for an exchange visa , it is written on the vfs website "Exchange permits may be issued to foreigners who are not older than 25 years of age" but on some website , it is specified that people have to be under 25 years old so I do not know if i am eligible.I was wondering if I may be eligible for a volunteer permit since I will benefit from a volunteer agreement ?

Thank you very much

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