The pension of the son shall be discontinued whenever he reaches 21 years of age. However, the payment of the pension thereto shall be carried on after having reached such age in the following cases:

1 - Should he be incapable of making a living and until the remedy of his disability.

Such disability shall be proven by virtue of a report from the competent medical committee, provided that the condition is reexamined every two years, unless the competent medical committee decides the improbability of his remedy.

2 - Should he be a student and until the employment thereof, or the practice thereby of a profession, or until he reaches twenty eight years of age, whichever is closer.

The payment of the pension to the student having reached the age of twenty eight shall be made during the academic year and until the end thereof.