diff --git a/bip-0085.mediawiki b/bip-0085.mediawiki
index b0f00abbef..547e5e8dfc 100644
--- a/bip-0085.mediawiki
+++ b/bip-0085.mediawiki
@@ -282,6 +282,47 @@ INPUT:
 OUTPUT
 * DERIVED ENTROPY=492db4698cf3b73a5a24998aa3e9d7fa96275d85724a91e71aa2d645442f878555d078fd1f1f67e368976f04137b1f7a0d19232136ca50c44614af72b5582a5c
 
+====<code>age</code> file encryption keys====
+
+A 32-byte HEX-application output at <code>m/83696968'/128169'/32'/{index}'</code> is a
+cryptographically random value usable directly as the secret key of an
+[https://age-encryption.org/v1 age] file-encryption identity. age has two identity flavors.
+Both encode a 32-byte seed. The matching recipient (public key) is derived from the seed as follows:
+
+{| class="wikitable"
+! Flavor !! Role !! HRP !! Bech32-encoded payload
+|-
+| classic (X25519) || identity || <code>AGE-SECRET-KEY-</code> || 32-byte seed
+|-
+| classic (X25519) || recipient || <code>age</code> || <code>X25519(seed, G)</code>, 32 bytes
+|-
+| post-quantum (X-Wing) || identity || <code>AGE-SECRET-KEY-PQ-</code> || 32-byte seed
+|-
+| post-quantum (X-Wing) || recipient || <code>age1pq</code> || X-Wing encapsulation key, 1216 bytes
+|}
+
+A given index SHOULD be used with only one flavor: a cryptographically-relevant quantum computer
+could recover the seed from the published classic recipient <code>X25519(seed, G)</code> and
+thereby also compromise the post-quantum identity derived from the same seed.
+
+Every string above takes the form <code>HRP || "1" || encode(payload) || checksum</code>, using the
+Bech32 (BIP-173) character set and checksum but without Bech32's 90-character length limit.
+<code>G</code> is the Curve25519 base point, so <code>X25519(seed, G)</code> is the classic
+recipient's public key. For the post-quantum flavor (age v1.3.0+), X-Wing SHAKE256-expands the
+seed into its ML-KEM-768 and X25519 components, and the recipient encodes the resulting
+1216-byte X-Wing encapsulation key.
+
+INPUT:
+* MASTER BIP32 ROOT KEY: xprv9s21ZrQH143K2LBWUUQRFXhucrQqBpKdRRxNVq2zBqsx8HVqFk2uYo8kmbaLLHRdqtQpUm98uKfu3vca1LqdGhUtyoFnCNkfmXRyPXLjbKb
+* PATH: m/83696968'/128169'/32'/0'
+
+OUTPUT:
+* DERIVED ENTROPY=ea3ceb0b02ee8e587779c63f4b7b3a21e950a213f1ec53cab608d13e8796e6dc
+* DERIVED AGE IDENTITY (classic)=AGE-SECRET-KEY-1AG7WKZCZA689SAMECCL5K7E6Y854PGSN78K98J4KPRGNAPUKUMWQWNNT4U
+* DERIVED AGE RECIPIENT (classic)=age1m0hhzxelxsxnxm4ennvdpk75j8s7mn5w4tt3e4ntug5qx256wslqmdz8e9
+* DERIVED AGE IDENTITY (PQ)=AGE-SECRET-KEY-PQ-1AG7WKZCZA689SAMECCL5K7E6Y854PGSN78K98J4KPRGNAPUKUMWQ5AN2M5
+* DERIVED AGE RECIPIENT (PQ) SHA-256 (of the 1959-char bech32 string, no trailing newline)=855bd04ee0cd6cfdf5717fb946d859824a79fbbdf6304dadcc11dbb91abe0df6
+
 ===PWD BASE64===
 Application number: 707764'