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    <p>2 Main problems to solve are:</p> <p><strong>1. Calculate Exact age</strong> - in years, months, days, etc.</p> <p><strong>2. Calculate Generally perceived age</strong> - people usually do not care how old they exactly are, they just care when their birthday in the current year is.</p> <hr> <p>Solution for <strong>1</strong> is obvious:</p> <pre><code>DateTime birth = DateTime.Parse("1.1.2000"); DateTime today = DateTime.Today; //we usually don't care about birth time TimeSpan age = today - birth; //.NET FCL should guarantee this as precise double ageInDays = age.TotalDays; //total number of days ... also precise double daysInYear = 365.2425; //statistical value for 400 years double ageInYears = ageInDays / daysInYear; //can be shifted ... not so precise </code></pre> <hr> <p>Solution for <strong>2</strong> is the one which is not so precise in determing total age, but is perceived as precise by people. People also usually use it, when they calculate their age "manually":</p> <pre><code>DateTime birth = DateTime.Parse("1.1.2000"); DateTime today = DateTime.Today; int age = today.Year - birth.Year; //people perceive their age in years if (today.Month &lt; birth.Month || ((today.Month == birth.Month) &amp;&amp; (today.Day &lt; birth.Day))) { age--; //birthday in current year not yet reached, we are 1 year younger ;) //+ no birthday for 29.2. guys ... sorry, just wrong date for birth } </code></pre> <p>Notes to 2.:</p> <ul> <li>This is my preferred solution</li> <li>We cannot use DateTime.DayOfYear or TimeSpans, as they shift number of days in leap years</li> <li>I have put there little more lines for readability</li> </ul> <p>Just one more note ... I would create 2 static overloaded methods for it, one for universal usage, second for usage-friendliness:</p> <pre><code>public static int GetAge(DateTime bithDay, DateTime today) { //chosen solution method body } public static int GetAge(DateTime birthDay) { return GetAge(birthDay, DateTime.Now); } </code></pre>
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    1. POHow do I calculate someone's age in C#?
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    1. USMarkus Safar
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