diff --git a/examples/EAGLE_low_z/EAGLE_100/eagle_100.yml b/examples/EAGLE_low_z/EAGLE_100/eagle_100.yml
index 51ebde355c064103344f5ed7a07699d0d23b2394..0cc97babbd2b89a7507808bfcad2648e0c03ce47 100644
--- a/examples/EAGLE_low_z/EAGLE_100/eagle_100.yml
+++ b/examples/EAGLE_low_z/EAGLE_100/eagle_100.yml
@@ -57,6 +57,8 @@ SPH:
   h_min_ratio:           0.1      # Minimal smoothing in units of softening.
   CFL_condition:         0.1      # Courant-Friedrich-Levy condition for time integration.
   minimal_temperature:   100      # (internal units)
+  overwrite_birth_time:  1
+  birth_time:            0.33333  # Pretend all the stars were born at z = 2
 
 # Parameters of the stars neighbour search
 Stars:
diff --git a/examples/EAGLE_low_z/EAGLE_12/eagle_12.yml b/examples/EAGLE_low_z/EAGLE_12/eagle_12.yml
index 4649dc372d39855161c3cb0aeb09a7a964255d5c..73f4e1a8d4269567d4139af6b992754d17494d3d 100644
--- a/examples/EAGLE_low_z/EAGLE_12/eagle_12.yml
+++ b/examples/EAGLE_low_z/EAGLE_12/eagle_12.yml
@@ -63,7 +63,9 @@ SPH:
 Stars:
   resolution_eta:        1.1642   # Target smoothing length in units of the mean inter-particle separation
   h_tolerance:           7e-3
-
+  overwrite_birth_time:  1
+  birth_time:            0.33333  # Pretend all the stars were born at z = 2
+  
 # Parameters for the Friends-Of-Friends algorithm
 FOF:
   basename:                        fof_output  # Filename for the FOF outputs.
diff --git a/examples/EAGLE_low_z/EAGLE_25/eagle_25.yml b/examples/EAGLE_low_z/EAGLE_25/eagle_25.yml
index cd2b4f06b3fc3723af480bd88d854f3d39d3eb12..f7a9394299fbf641a98b2ffc2d7c4bac364c164e 100644
--- a/examples/EAGLE_low_z/EAGLE_25/eagle_25.yml
+++ b/examples/EAGLE_low_z/EAGLE_25/eagle_25.yml
@@ -71,6 +71,8 @@ SPH:
 Stars:
   resolution_eta:        1.1642   # Target smoothing length in units of the mean inter-particle separation
   h_tolerance:           7e-3
+  overwrite_birth_time:  1
+  birth_time:            0.33333  # Pretend all the stars were born at z = 2
 
 # Parameters for the Friends-Of-Friends algorithm
 FOF:
diff --git a/examples/EAGLE_low_z/EAGLE_50/eagle_50.yml b/examples/EAGLE_low_z/EAGLE_50/eagle_50.yml
index 54a1c47404c15a8574c02e93bba3e8931b5e59c3..ea46a9ad677d8e37ec48a83645a4501e8bdc842f 100644
--- a/examples/EAGLE_low_z/EAGLE_50/eagle_50.yml
+++ b/examples/EAGLE_low_z/EAGLE_50/eagle_50.yml
@@ -62,6 +62,8 @@ SPH:
 Stars:
   resolution_eta:        1.1642   # Target smoothing length in units of the mean inter-particle separation
   h_tolerance:           7e-3
+  overwrite_birth_time:  1
+  birth_time:            0.33333  # Pretend all the stars were born at z = 2
 
 # Parameters for the Friends-Of-Friends algorithm
 FOF:
diff --git a/examples/EAGLE_low_z/EAGLE_6/eagle_6.yml b/examples/EAGLE_low_z/EAGLE_6/eagle_6.yml
index 140dec0022e21091702ec61222be29be7fe3b56f..27082dd0b881279c6631dfdc1edb0ac8ea3d07c6 100644
--- a/examples/EAGLE_low_z/EAGLE_6/eagle_6.yml
+++ b/examples/EAGLE_low_z/EAGLE_6/eagle_6.yml
@@ -72,6 +72,8 @@ SPH:
 Stars:
   resolution_eta:        1.1642   # Target smoothing length in units of the mean inter-particle separation
   h_tolerance:           7e-3
+  overwrite_birth_time:  1
+  birth_time:            0.33333  # Pretend all the stars were born at z = 2
 
 # Parameters for the Friends-Of-Friends algorithm
 FOF:
diff --git a/examples/IsolatedGalaxy/IsolatedGalaxy_feedback/isolated_galaxy.yml b/examples/IsolatedGalaxy/IsolatedGalaxy_feedback/isolated_galaxy.yml
index 79fe5682692347127081f021ed6930df57bbfa02..dcd580243c51b0cbfb24c684709e1e511829f089 100644
--- a/examples/IsolatedGalaxy/IsolatedGalaxy_feedback/isolated_galaxy.yml
+++ b/examples/IsolatedGalaxy/IsolatedGalaxy_feedback/isolated_galaxy.yml
@@ -45,6 +45,11 @@ SPH:
   h_max:                 10.
   minimal_temperature:   100.
 
+# Parameters for the stars neighbour search
+Stars:
+  overwrite_birth_time:    1     # Make sure the stars in the ICs do not do any feedback
+  birth_time:             -1.    # by setting all of their birth times to -1  
+
 # Standard EAGLE cooling options
 EAGLECooling:
   dir_name:                ./coolingtables/  # Location of the Wiersma+08 cooling tables
diff --git a/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/isolated_galaxy.yml b/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/isolated_galaxy.yml
index d917f926724c022cd15524058ddde2a7466acaab..fe57f693b0fcba6d8bc70c0fddf2d9dce2e60b99 100644
--- a/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/isolated_galaxy.yml
+++ b/examples/IsolatedGalaxy/IsolatedGalaxy_starformation/isolated_galaxy.yml
@@ -45,6 +45,11 @@ SPH:
   h_max:                 10.
   minimal_temperature:   10.      # Kelvin
 
+# Parameters for the stars neighbour search
+Stars:
+  overwrite_birth_time:    1     # Make sure the stars in the ICs do not do any feedback
+  birth_time:             -1.    # by setting all of their birth times to -1  
+  
 # Standard EAGLE cooling options
 EAGLECooling:
   dir_name:                ./coolingtables/  # Location of the Wiersma+08 cooling tables