rpc, net: completely remove `startingheight` field of `getpeerinfo` RPC

diff --git a/doc/release-notes-34796.md b/doc/release-notes-34796.md
new file mode 100644
index 00000000..a09786bf
--- /dev/null
+++ b/doc/release-notes-34796.md
@@ -0,0 +1,6 @@
+Updated RPCs
+------------
+
+- The `-deprecatedrpc=startingheight` configuration option has been removed.
+  The `getpeerinfo` RPC no longer returns the `startingheight` field, which
+  was previously deprecated in v31.0. (#34796)
diff --git a/src/rpc/net.cpp b/src/rpc/net.cpp
index 5c54e207..ea07c560 100644
--- a/src/rpc/net.cpp
+++ b/src/rpc/net.cpp
@@ -161,7 +161,6 @@ static RPCHelpMan getpeerinfo()
                     {RPCResult::Type::BOOL, "inbound", "Inbound (true) or Outbound (false)"},
                     {RPCResult::Type::BOOL, "bip152_hb_to", "Whether we selected peer as (compact blocks) high-bandwidth peer"},
                     {RPCResult::Type::BOOL, "bip152_hb_from", "Whether peer selected us as (compact blocks) high-bandwidth peer"},
-                    {RPCResult::Type::NUM, "startingheight", /*optional=*/true, "(DEPRECATED, returned only if config option -deprecatedrpc=startingheight is passed) The starting height (block) of the peer"},
                     {RPCResult::Type::NUM, "presynced_headers", "The current height of header pre-synchronization with this peer, or -1 if no low-work sync is in progress"},
                     {RPCResult::Type::NUM, "synced_headers", "The last header we have in common with this peer"},
                     {RPCResult::Type::NUM, "synced_blocks", "The last block we have in common with this peer"},
@@ -268,9 +267,6 @@ static RPCHelpMan getpeerinfo()
         obj.pushKV("inbound", stats.fInbound);
         obj.pushKV("bip152_hb_to", stats.m_bip152_highbandwidth_to);
         obj.pushKV("bip152_hb_from", stats.m_bip152_highbandwidth_from);
-        if (IsDeprecatedRPCEnabled("startingheight")) {
-            obj.pushKV("startingheight", statestats.m_starting_height);
-        }
         obj.pushKV("presynced_headers", statestats.presync_height);
         obj.pushKV("synced_headers", statestats.nSyncHeight);
         obj.pushKV("synced_blocks", statestats.nCommonHeight);
diff --git a/test/functional/rpc_net.py b/test/functional/rpc_net.py
index 30e0d536..24769e2b 100755
--- a/test/functional/rpc_net.py
+++ b/test/functional/rpc_net.py
@@ -63,7 +63,7 @@ class NetTest(BitcoinTestFramework):
     def set_test_params(self):
         self.num_nodes = 2
         self.extra_args = [
-            ["-minrelaytxfee=0.00001000", "-deprecatedrpc=startingheight"],
+            ["-minrelaytxfee=0.00001000"],
             ["-minrelaytxfee=0.00000500"],
         ]
         # Specify a non-working proxy to make sure no actual connections to public IPs are attempted
@@ -174,7 +174,6 @@ class NetTest(BitcoinTestFramework):
                 "services": "0000000000000000",
                 "servicesnames": [],
                 "session_id": "" if not self.options.v2transport else no_version_peer.v2_state.peer['session_id'].hex(),
-                "startingheight": -1,
                 "subver": "",
                 "synced_blocks": -1,
                 "synced_headers": -1,