diff --git a/CourseApp.Tests/CalcAgeTest.cs b/CourseApp.Tests/CalcAgeTest.cs
new file mode 100644
index 0000000..652304f
--- /dev/null
+++ b/CourseApp.Tests/CalcAgeTest.cs
@@ -0,0 +1,51 @@
+using System;
+using Xunit;
+
+namespace CourseApp.Tests
+{
+    public class CalcAgeTest
+    {
+        [Fact]
+        public void CorrectAgeInputTest()
+        {
+            Assert.Equal(CalcAge.CalculateAge(18, 12, 2000, 19, 12, 2019, true), $"Возраст:19 лет, 0 месяцев, 1 дней");
+        }
+
+        [Fact]
+        public void FutureDateInputTest()
+        {
+            try
+            {
+                CalcAge.CalculateAge(16, 6, 2021, true);
+            }
+            catch
+            {
+                Assert.True(true);
+            }
+        }
+
+        [Fact]
+        public void CurrentDayIsBirthdayTest()
+        {
+            var day = DateTime.Today.Day;
+            var month = DateTime.Today.Month;
+            var year = DateTime.Today.Year;
+            try
+            {
+                Assert.Equal(CalcAge.CalculateAge(12, 12, 2019, 12, 12, 2019, true), $"Возраст:0 лет, 0 месяцев, 0 дней");
+            }
+            catch
+            {
+                Assert.True(true);
+            }
+        }
+
+        [Theory]
+        [InlineData(30, 12, 2000, 18)]
+        [InlineData(16, 12, 2000, 19)]
+        public void CurrectYearCountTest(int d, int m, int y, int exp)
+        {
+            Assert.Equal($"Возраст:{exp} лет", CalcAge.CalculateAge(d, m, y, 19, 12, 2019, false));
+        }
+    }
+}
\ No newline at end of file
diff --git a/CourseApp/CalcAge.cs b/CourseApp/CalcAge.cs
new file mode 100644
index 0000000..d36928f
--- /dev/null
+++ b/CourseApp/CalcAge.cs
@@ -0,0 +1,40 @@
+using System;
+
+namespace CourseApp
+{
+    public static class CalcAge
+    {
+        public static string CalculateAge(int day, int month, int year, bool fullAge)
+        {
+            var today = DateTime.Today;
+            return CalcAge.CalculateAge(day, month, year, today.Day, today.Month, today.Year, fullAge);
+        }
+
+        public static string CalculateAge(int day, int month, int year, int currDay, int currMonth, int currYear, bool fullAge)
+        {
+            var birthday = new DateTime(year, month, day);
+            var today = new DateTime(currYear, currMonth, currDay);
+
+            if (birthday.Ticks > today.Ticks)
+            {
+                throw new Exception("you cannot enter a date that did not occur");
+            }
+            else if (birthday.Ticks == today.Ticks)
+            {
+                throw new Exception("he/she/you was born today");
+            }
+            else
+            {
+                var age = new DateTime(today.Ticks - birthday.Ticks);
+                if (fullAge == true)
+                {
+                    return $"Возраст:{age.Year - 1} лет, {age.Month - 1} месяцев, {age.Day - 1} дней";
+                }
+                else
+                {
+                    return $"Возраст:{age.Year - 1} лет";
+                }
+            }
+        }
+    }
+}
diff --git a/CourseApp/Program.cs b/CourseApp/Program.cs
index cb9854c..dec4146 100644
--- a/CourseApp/Program.cs
+++ b/CourseApp/Program.cs
@@ -72,6 +72,8 @@ public static void Main(string[] args)
                 Console.WriteLine($"y={item}");
             }
 
+            Console.WriteLine(CalcAge.CalculateAge(28, 6, 2000, true));
+
             Console.ReadLine();
         }
     }