If x is Maria's age, then Mario's age is x + 1.

The equation that represents the sum of their ages is x + x + 1 = 7.

By combining like terms, the equation becomes 2x = 6.

Hence, the value of x which represents the age of Maria is 6/2=<<6/2=3>>3.

So Mariu is 3 + 1 = <<3+1=4>>4 years old.

# Answer

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<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
The sum of Mario and Maria's ages now is 7. Mario is 1 year older than Maria. How old is Mario?
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
4
The sum of Mario and Maria's ages now is 7. Mario is 1 year older than Maria. How old is Mario?
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