Technically one's age has to be larger than 0 for one to be considered to be existing.

(Therefore I don't consider this question as ambiguous.)

But you don't really have to care if it is age in years or in days.

For III:

R=2S

S=T-3

From this we know:

R=2(T-3)=2T-6

We want to know if R-T>0.

R-T=2T-6-T=T-6

The answer depends on whether T is greater than 6 years old. So if T is now 4 years old, for example, then we know that R is littler (2year old). If T is 7 years old now, then we know that R is older (8 year old). It really doesn't matter whether it is 4 years from now or not. However, III could be right or wrong from the beginning.

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Keep on asking, and it will be given you;

keep on seeking, and you will find;

keep on knocking, and it will be opened to you.