diff --git a/src/main/java/dev/personnummer/Personnummer.java b/src/main/java/dev/personnummer/Personnummer.java
index e1ba985..baae5bb 100644
--- a/src/main/java/dev/personnummer/Personnummer.java
+++ b/src/main/java/dev/personnummer/Personnummer.java
@@ -51,6 +51,50 @@ public static Personnummer parse(String personnummer) throws PersonnummerExcepti
     private final boolean isMale;
     private final boolean isFemale;
 
+    public Boolean isMale() {
+        return this.isMale;
+    }
+
+    public Boolean isFemale() {
+        return this.isFemale;
+    }
+
+    public String separator() {
+        return this.getAge() >= 100 ? "+" : "-";
+    }
+
+    public String getFullYear() {
+        return fullYear;
+    }
+
+    public String getCentury() {
+        return century;
+    }
+
+    public String getYear() {
+        return year;
+    }
+
+    public String getMonth() {
+        return month;
+    }
+
+    public String getDay() {
+        return day;
+    }
+
+    public String getNumbers() {
+        return numbers;
+    }
+
+    public String getControlNumber() {
+        return controlNumber;
+    }
+
+    public int getAge() {
+        return (LocalDate.of(Integer.parseInt(this.fullYear), Integer.parseInt(this.month), this.realDay).until(LocalDate.now())).getYears();
+    }
+
     /**
      * Create a new Personnummber object from a string.
      * In case options is not passed, they will default to accept any personal and coordination numbers.
@@ -61,12 +105,12 @@ public static Personnummer parse(String personnummer) throws PersonnummerExcepti
      */
     public Personnummer(String personnummer, Options options) throws PersonnummerException {
         if (personnummer == null) {
-            throw new PersonnummerException();
+            throw new PersonnummerException("Failed to parse personal identity number. Invalid input.");
         }
 
         Matcher matches = regexPattern.matcher(personnummer);
         if (!matches.find()) {
-            throw new PersonnummerException();
+            throw new PersonnummerException("Failed to parse personal identity number. Invalid input.");
         }
 
         String century;
@@ -88,7 +132,7 @@ public Personnummer(String personnummer, Options options) throws PersonnummerExc
         if (options.allowCoordinationNumber) {
             day = day > 60 ? day - 60 : day;
         } else if(day > 60) {
-            throw new PersonnummerException();
+            throw new PersonnummerException("Invalid personal identity number.");
         }
 
         this.realDay = day;
@@ -106,7 +150,7 @@ public Personnummer(String personnummer, Options options) throws PersonnummerExc
         // The format passed to Luhn method is supposed to be YYmmDDNNN
         // Hence all numbers that are less than 10 (or in last case 100) will have leading 0's added.
         if (luhn(String.format("%s%s%s%s", this.year, this.month, this.day, matches.group(6))) != Integer.parseInt(this.controlNumber)) {
-            throw new PersonnummerException();
+            throw new PersonnummerException("Invalid personal identity number.");
         }
     }
 
@@ -121,10 +165,6 @@ public Personnummer(String personnummer) throws PersonnummerException {
         this(personnummer, new Options());
     }
 
-    public int getAge() {
-        return (LocalDate.of(Integer.parseInt(this.fullYear), Integer.parseInt(this.month), this.realDay).until(LocalDate.now())).getYears();
-    }
-
     /**
      * Format the personal identity number into a valid string (YYMMDD-/+XXXX)
      * If longFormat is true, it will include the century (YYYYMMDD-/+XXXX)
@@ -146,46 +186,6 @@ public String format(boolean longFormat) {
         return (longFormat ? this.fullYear : this.year) + this.month + this.day + separator() + numbers;
     }
 
-    public Boolean isMale() {
-        return this.isMale;
-    }
-
-    public Boolean isFemale() {
-        return this.isFemale;
-    }
-
-    public String separator() {
-        return this.getAge() >= 100 ? "+" : "-";
-    }
-
-    public String getFullYear() {
-        return fullYear;
-    }
-
-    public String getCentury() {
-        return century;
-    }
-
-    public String getYear() {
-        return year;
-    }
-
-    public String getMonth() {
-        return month;
-    }
-
-    public String getDay() {
-        return day;
-    }
-
-    public String getNumbers() {
-        return numbers;
-    }
-
-    public String getControlNumber() {
-        return controlNumber;
-    }
-
     /**
      * Validate a Swedish personal identity number.
      *
diff --git a/src/main/java/dev/personnummer/PersonnummerException.java b/src/main/java/dev/personnummer/PersonnummerException.java
index 508c0c7..be13965 100644
--- a/src/main/java/dev/personnummer/PersonnummerException.java
+++ b/src/main/java/dev/personnummer/PersonnummerException.java
@@ -1,3 +1,7 @@
 package dev.personnummer;
 
-public class PersonnummerException extends Exception { }
+public class PersonnummerException extends Exception {
+    PersonnummerException(String message) {
+        super(message);
+    }
+}