# Python program to calculate age in year

Given birth date in y/m/d format, write a Python program to find the present age in years.

Examples:

```Input : 1997/2/3
Output : 21 years (for present year i.e 2018)

Input : 2010/12/25
Output : 8 years (for present year i.e 2018)
```

Approach # 1:
The naive approach to find the current age in years is to find the difference between the current year and birth year. Refer the Naive appraoch from here.

Approach #2: Using datetime module
Python provides datetime module to deal with all datetime related issues in python. Using datetime we can find the age by subtracting birth year from current year. Along with this, we need to focus on the birth month and birthday. For this, we check if current month and date are less than birth month and date. If yes subtract 1 from age, otherwise 0.

 `# Python3 code to  calculate age in years ` ` `  `from` `datetime ``import` `date ` ` `  `def` `calculateAge(birthDate): ` `    ``today ``=` `date.today() ` `    ``age ``=` `today.year ``-` `birthDate.year ``-`  `         ``((today.month, today.day) < ` `         ``(birthDate.month, birthDate.day)) ` ` `  `    ``return` `age ` `     `  `# Driver code  ` `print``(calculateAge(date(``1997``, ``2``, ``3``)), ``"years"``) `

Output:

```21 years
```

Approach #3 : Efficient datetime approach
The above approaches do not deal with a special case i.e. when birth date is February 29 and the current year is not a leap year. This case has to be raised as an exception because the calculation of birthdate may be inaccurate. This method includes try and catch for this exception.

 `# Python3 code to  calculate age in years ` `from` `datetime ``import` `date ` ` `  `def` `calculateAge(born): ` `    ``today ``=` `date.today() ` `    ``try``:  ` `        ``birthday ``=` `born.replace(year ``=` `today.year) ` ` `  `    ``# raised when birth date is February 29 ` `    ``# and the current year is not a leap year ` `    ``except` `ValueError:  ` `        ``birthday ``=` `born.replace(year ``=` `today.year, ` `                  ``month ``=` `born.month ``+` `1``, day ``=` `1``) ` ` `  `    ``if` `birthday > today: ` `        ``return` `today.year ``-` `born.year ``-` `1` `    ``else``: ` `        ``return` `today.year ``-` `born.year ` `         `  `# Driver code ` `print``(calculateAge(date(``1997``, ``2``, ``3``)), ``"years"``) `

Output:

```21 years
```

Approach #4: Using division

In this approach, we calculate the number of date from the birth date till current date. Divide the number of date by the days in a year i.e 365.2425.

 `# Python3 code to  calculate age in years ` `from` `datetime ``import` `date ` ` `  `def` `calculateAge(birthDate): ` `    ``days_in_year ``=` `365.2425`     `    ``age ``=` `int``((date.today() ``-` `birthDate).days ``/` `days_in_year) ` `    ``return` `age ` `         `  `# Driver code ` `print``(calculateAge(date(``1997``, ``2``, ``3``)), ``"years"``) `

Output:

```21 years
```

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