diff --git a/exercises/practice/space-age/.meta/src/reference/java/SpaceAge.java b/exercises/practice/space-age/.meta/src/reference/java/SpaceAge.java
index 6143ed0b5..67e1bbaf1 100644
--- a/exercises/practice/space-age/.meta/src/reference/java/SpaceAge.java
+++ b/exercises/practice/space-age/.meta/src/reference/java/SpaceAge.java
@@ -1,5 +1,3 @@
-import java.math.BigDecimal;
-
 class SpaceAge {
 
     private enum Planet {
@@ -24,8 +22,6 @@ private double getRelativeOrbitalPeriod() {
     }
 
     private static final double EARTH_ORBITAL_PERIOD_IN_SECONDS = 31557600.0;
-    private static final int PRECISION = 2;
-
     private double seconds;
 
     SpaceAge(double seconds) {
@@ -65,9 +61,7 @@ private double getRelativeOrbitalPeriod() {
     }
 
     private double calculateAge(Planet planet) {
-        double age = seconds / (EARTH_ORBITAL_PERIOD_IN_SECONDS * planet.getRelativeOrbitalPeriod());
-
-        return new BigDecimal(age).setScale(PRECISION, BigDecimal.ROUND_HALF_UP).doubleValue();
+        return (seconds / EARTH_ORBITAL_PERIOD_IN_SECONDS) / planet.getRelativeOrbitalPeriod();
     }
 
 }
diff --git a/exercises/practice/space-age/.meta/tests.toml b/exercises/practice/space-age/.meta/tests.toml
index b4a221dc9..4b65f23af 100644
--- a/exercises/practice/space-age/.meta/tests.toml
+++ b/exercises/practice/space-age/.meta/tests.toml
@@ -1,6 +1,13 @@
-# This is an auto-generated file. Regular comments will be removed when this
-# file is regenerated. Regenerating will not touch any manually added keys,
-# so comments can be added in a "comment" key.
+# This is an auto-generated file.
+#
+# Regenerating this file via `configlet sync` will:
+# - Recreate every `description` key/value pair
+# - Recreate every `reimplements` key/value pair, where they exist in problem-specifications
+# - Remove any `include = true` key/value pair (an omitted `include` key implies inclusion)
+# - Preserve any other key/value pair
+#
+# As user-added comments (using the # character) will be removed when this file
+# is regenerated, comments can be added via a `comment` key.
 
 [84f609af-5a91-4d68-90a3-9e32d8a5cd34]
 description = "age on Earth"
@@ -25,3 +32,8 @@ description = "age on Uranus"
 
 [80096d30-a0d4-4449-903e-a381178355d8]
 description = "age on Neptune"
+
+[57b96e2a-1178-40b7-b34d-f3c9c34e4bf4]
+description = "invalid planet causes error"
+include = false
+comment = "Excluded because the design of the exercise does not allow for arbitrary planets"
diff --git a/exercises/practice/space-age/src/test/java/SpaceAgeTest.java b/exercises/practice/space-age/src/test/java/SpaceAgeTest.java
index 72a551dc4..fdf5172d8 100644
--- a/exercises/practice/space-age/src/test/java/SpaceAgeTest.java
+++ b/exercises/practice/space-age/src/test/java/SpaceAgeTest.java
@@ -2,7 +2,7 @@
 import org.junit.Test;
 
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.assertj.core.api.Assertions.within;
+import static org.assertj.core.api.Assertions.offset;
 
 public class SpaceAgeTest {
 
@@ -12,7 +12,7 @@ public class SpaceAgeTest {
     public void ageOnEarth() {
         SpaceAge age = new SpaceAge(1000000000);
 
-        assertThat(age.onEarth()).isEqualTo(31.69, within(MAXIMUM_DELTA));
+        assertThat(age.onEarth()).isEqualTo(31.69, offset(MAXIMUM_DELTA));
     }
 
     @Ignore("Remove to run test")
@@ -20,7 +20,7 @@ public void ageOnEarth() {
     public void ageOnMercury() {
         SpaceAge age = new SpaceAge(2134835688);
 
-        assertThat(age.onMercury()).isEqualTo(280.88, within(MAXIMUM_DELTA));
+        assertThat(age.onMercury()).isEqualTo(280.88, offset(MAXIMUM_DELTA));
     }
 
     @Ignore("Remove to run test")
@@ -28,7 +28,7 @@ public void ageOnMercury() {
     public void ageOnVenus() {
         SpaceAge age = new SpaceAge(189839836);
 
-        assertThat(age.onVenus()).isEqualTo(9.78, within(MAXIMUM_DELTA));
+        assertThat(age.onVenus()).isEqualTo(9.78, offset(MAXIMUM_DELTA));
     }
 
     @Ignore("Remove to run test")
@@ -36,7 +36,7 @@ public void ageOnVenus() {
     public void ageOnMars() {
         SpaceAge age = new SpaceAge(2129871239L);
 
-        assertThat(age.onMars()).isEqualTo(35.88, within(MAXIMUM_DELTA));
+        assertThat(age.onMars()).isEqualTo(35.88, offset(MAXIMUM_DELTA));
     }
 
     @Ignore("Remove to run test")
@@ -44,7 +44,7 @@ public void ageOnMars() {
     public void ageOnJupiter() {
         SpaceAge age = new SpaceAge(901876382);
 
-        assertThat(age.onJupiter()).isEqualTo(2.41, within(MAXIMUM_DELTA));
+        assertThat(age.onJupiter()).isEqualTo(2.41, offset(MAXIMUM_DELTA));
     }
 
     @Ignore("Remove to run test")
@@ -52,7 +52,7 @@ public void ageOnJupiter() {
     public void ageOnSaturn() {
         SpaceAge age = new SpaceAge(2000000000L);
 
-        assertThat(age.onSaturn()).isEqualTo(2.15, within(MAXIMUM_DELTA));
+        assertThat(age.onSaturn()).isEqualTo(2.15, offset(MAXIMUM_DELTA));
     }
 
     @Ignore("Remove to run test")
@@ -60,7 +60,7 @@ public void ageOnSaturn() {
     public void ageOnUranus() {
         SpaceAge age = new SpaceAge(1210123456L);
 
-        assertThat(age.onUranus()).isEqualTo(0.46, within(MAXIMUM_DELTA));
+        assertThat(age.onUranus()).isEqualTo(0.46, offset(MAXIMUM_DELTA));
     }
 
     @Ignore("Remove to run test")
@@ -68,6 +68,6 @@ public void ageOnUranus() {
     public void ageOnNeptune() {
         SpaceAge age = new SpaceAge(1821023456L);
 
-        assertThat(age.onNeptune()).isEqualTo(0.35, within(MAXIMUM_DELTA));
+        assertThat(age.onNeptune()).isEqualTo(0.35, offset(MAXIMUM_DELTA));
     }
 }