Let x be the age of Nina.

So, Leonard's age is x - 4.

And Jerome's age is 2x.

Since the sum of their ages is 36, then the equation is x + x - 4 + 2x = 36.

By combining like terms, the equation becomes 4x = 40.

So the value of x which represents the age of Nina is x = 40/4 = <<40/4=10>>10.

Therefore, Leonard is 10 - 4 = <<10-4=6>>6 years old.

# Answer

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<|im_start|>system
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<|im_start|>user
Leonard is 4 years younger than Nina who is half as old as Jerome. If the sum of their ages is 36, what is Leonard's age?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
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Leonard is 4 years younger than Nina who is half as old as Jerome. If the sum of their ages is 36, what is Leonard's age?
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