The present invention relates to a rehydration composition intended for the preparation of a solution by reconstitution in water, preferably slightly mineralized water. According to the invention, this composition comprises the following constituents in the specific proportions mentioned in claim 1: sodium; potassium; chloride; glucose-providing carbohydrate source; at least one water-soluble amino compound chosen from amino acids, peptides and polypeptides; at least one vitamin chosen from: vitamin C; vitamin B1; vitamin B2; vitamin B3; vitamin B6; vitamin B8; vitamin B9; vitamin B12; said solution having an osmolarity between 150 and 200 mosmol/l. This composition is particularly suitable for the rehydration of elderly people.