Census 2011 defines a literate person as someone who is aged seven and above and can both read and write with understanding in any language. This means that option 1 is the correct statement. Options 2, 3, and 4 are incorrect because they set the minimum age requirement at eight, nine, and ten respectively, whereas the Census 2011 considers individuals aged seven and above as literate if they meet the criteria of being able to read and write with understanding.

It is important to note that the Census 2011 focuses on the ability to read and write, regardless of the language. So, the language in which the person can read and write does not affect their classification as literate. The primary consideration is the individual`s ability to comprehend written text and express their thoughts in written form.

Therefore, the correct answer is option 1, which indicates that a person aged seven and above who can both read and write with understanding in any language is treated as a literate for the purpose of Census 2011.