A Young Lady :

There was a young lady of Lee,

Whose age had its last digit three.

If you total the two,

Which is easy to do,

One less than a square you will see.

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A Young Lady : ANSWER

Assume her age was (10x+3). Then, x+3 = n.n-1.

So, x = n.n-4. Since x is a single digit number, x = 5.

So her age was 53 years.