various fixes (#6252)

see commits

fixes stuff in maintainer bug triage

---------

Co-authored-by: silicons <no@you.cat>

code/modules/client/data/client_data.dm

@@ -21,9 +21,9 @@ GLOBAL_LIST_EMPTY(client_data)
 	var/key
 	/// absolutely, positively annihilated
 	var/ligma = FALSE
-	/// byond account join date
+	/// byond account join date; null = not loaded
 	var/account_join
-	/// byond account age
+	/// byond account age; null = not loaded
 	var/account_age
 	/// is guest
 	var/is_guest
@@ -47,7 +47,7 @@ GLOBAL_LIST_EMPTY(client_data)
 
 	is_guest = IsGuestKey(key)
 
-	load_account_age()
+	INVOKE_ASYNC(src, PROC_REF(load_account_age))
 
 	var/list/the_cheese_touch = CONFIG_GET(keyed_list/shadowban)
 	var/client/C = GLOB.directory[src.ckey]