Need Code on Calculate Age of the person based on Date of Birth using Unix Shell Script ( Charges are applicable )

Consider an input or input file with information about a person name and his/her date of birth. Generate an output or output file with same person name and his/her age. 

Example: 

User Friendly Provided Person Name and Date of birth.

Output based on Person Name and Age.

Or Based on Input file:

Output:

If interest or Need Unix Shell Script or guidance on How to Calculate Age of the person based on Date of Birth provided as input.

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