Fountain of Youth

Tell me the truth. Can this water restore my youth?
There was an old doctor who told his friends,
"I can make you young again."
Here is some water from the fountain of youth.
It will make you young, I tell the truth.
Taking a sip of that water,
Made the old woman as young as her daughter.
Is is true that this water can restore my youth?
Well, I've come to the conclusion,
What the doctor saw was a remarkable illusion!