dum fuit infra aetate

from Bouvier's Law Dictionary, Revised 6th Ed (1856)
DUM FUIT INFRA AETATEM. The name of a writ which lies when an infant has 
made a feoffment in fee of his lands, or for life, of a gift in tail. 
     2. It may be sued out by him after he comes of full age, and not 
before; but, in the mean time, he may enter, and his entry remits him to his 
ancestor's rights. F. N. B. 192; Co. Litt. 247, 337. 
    

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