Here is how to get a user’s age from date of birth

If you need get a user’s age from a given date of birth string, this code below can be used for that

The date of birth string must be in DD/MM/YYYY format

  private int getAge(String dobString){

        Date date = null;
        SimpleDateFormat sdf = new SimpleDateFormat("dd/MM/yyyy");
        try {
            date = sdf.parse(dobString);
        } catch (ParseException e) {
            e.printStackTrace();
        }

        if(date == null) return 0;

        Calendar dob = Calendar.getInstance();
        Calendar today = Calendar.getInstance();

        dob.setTime(date);

        int year = dob.get(Calendar.YEAR);
        int month = dob.get(Calendar.MONTH);
        int day = dob.get(Calendar.DAY_OF_MONTH);

        dob.set(year, month+1, day);

        int age = today.get(Calendar.YEAR) - dob.get(Calendar.YEAR);

        if (today.get(Calendar.DAY_OF_YEAR) < dob.get(Calendar.DAY_OF_YEAR)) {
            age--;
        }
        return age;
}

When you call this, it will return the age based on the string you provided.

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