diff --git a/backend/src/main/java/com/petshop/backend/dto/pet/MyPetRequest.java b/backend/src/main/java/com/petshop/backend/dto/pet/MyPetRequest.java
index 17d08e2f..37942a47 100644
--- a/backend/src/main/java/com/petshop/backend/dto/pet/MyPetRequest.java
+++ b/backend/src/main/java/com/petshop/backend/dto/pet/MyPetRequest.java
@@ -1,5 +1,7 @@
 package com.petshop.backend.dto.pet;
 
+import jakarta.validation.constraints.Max;
+import jakarta.validation.constraints.Min;
 import jakarta.validation.constraints.NotBlank;
 import jakarta.validation.constraints.Size;
 
@@ -16,6 +18,10 @@ public class MyPetRequest {
     @Size(max = 50, message = "Breed must not exceed 50 characters")
     private String breed;
 
+    @Min(value = 0, message = "Age must be 0 or greater")
+    @Max(value = 100, message = "Age must not exceed 100")
+    private Integer petAge;
+
     public String getPetName() {
         return petName;
     }
@@ -39,4 +45,12 @@ public class MyPetRequest {
     public void setBreed(String breed) {
         this.breed = breed;
     }
+
+    public Integer getPetAge() {
+        return petAge;
+    }
+
+    public void setPetAge(Integer petAge) {
+        this.petAge = petAge;
+    }
 }
diff --git a/backend/src/main/java/com/petshop/backend/dto/pet/MyPetResponse.java b/backend/src/main/java/com/petshop/backend/dto/pet/MyPetResponse.java
index bea9c276..15117334 100644
--- a/backend/src/main/java/com/petshop/backend/dto/pet/MyPetResponse.java
+++ b/backend/src/main/java/com/petshop/backend/dto/pet/MyPetResponse.java
@@ -6,17 +6,19 @@ public class MyPetResponse {
     private String petName;
     private String species;
     private String breed;
+    private Integer petAge;
     private String imageUrl;
     private String petStatus;
 
     public MyPetResponse() {
     }
 
-    public MyPetResponse(Long customerPetId, String petName, String species, String breed, String imageUrl, String petStatus) {
+    public MyPetResponse(Long customerPetId, String petName, String species, String breed, Integer petAge, String imageUrl, String petStatus) {
         this.customerPetId = customerPetId;
         this.petName = petName;
         this.species = species;
         this.breed = breed;
+        this.petAge = petAge;
         this.imageUrl = imageUrl;
         this.petStatus = petStatus;
     }
@@ -53,6 +55,14 @@ public class MyPetResponse {
         this.breed = breed;
     }
 
+    public Integer getPetAge() {
+        return petAge;
+    }
+
+    public void setPetAge(Integer petAge) {
+        this.petAge = petAge;
+    }
+
     public String getImageUrl() {
         return imageUrl;
     }
diff --git a/backend/src/main/java/com/petshop/backend/service/PetService.java b/backend/src/main/java/com/petshop/backend/service/PetService.java
index 1fe51b19..dd86eb4a 100644
--- a/backend/src/main/java/com/petshop/backend/service/PetService.java
+++ b/backend/src/main/java/com/petshop/backend/service/PetService.java
@@ -357,6 +357,7 @@ public class PetService {
                 pet.getPetName(),
                 pet.getPetSpecies(),
                 pet.getPetBreed(),
+                pet.getPetAge(),
                 pet.getImageUrl() != null && !pet.getImageUrl().isBlank() ? "/api/v1/pets/" + pet.getPetId() + "/image" : null,
                 pet.getPetStatus()
         );
@@ -366,7 +367,7 @@ public class PetService {
         pet.setPetName(request.getPetName().trim());
         pet.setPetSpecies(request.getSpecies().trim());
         pet.setPetBreed(normalizeOptional(request.getBreed()));
-        pet.setPetAge(null);
+        pet.setPetAge(request.getPetAge());
         pet.setPetPrice(null);
     }
 
diff --git a/web/app/profile/page.js b/web/app/profile/page.js
index 6920ad6a..1b251593 100644
--- a/web/app/profile/page.js
+++ b/web/app/profile/page.js
@@ -30,6 +30,7 @@ export default function ProfilePage() {
   const [petName, setPetName] = useState("");
   const [species, setSpecies] = useState("");
   const [breed, setBreed] = useState("");
+  const [petAge, setPetAge] = useState("1");
   const [submitting, setSubmitting] = useState(false);
   const [petError, setPetError] = useState(null);
   const [profileForm, setProfileForm] = useState({ fullName: "", email: "", phone: "" });
@@ -230,6 +231,7 @@ if (user?.role === "CUSTOMER" || user?.role === "ADMIN") {
     setPetName("");
     setSpecies("");
     setBreed("");
+    setPetAge("1");
     setPetError(null);
     setShowForm(true);
   }
@@ -239,6 +241,7 @@ if (user?.role === "CUSTOMER" || user?.role === "ADMIN") {
     setPetName(pet.petName);
     setSpecies(pet.species);
     setBreed(pet.breed || "");
+    setPetAge(pet.petAge != null ? String(pet.petAge) : "1");
     setPetError(null);
     setShowForm(true);
   }
@@ -265,7 +268,7 @@ if (user?.role === "CUSTOMER" || user?.role === "ADMIN") {
           "Content-Type": "application/json",
           Authorization: `Bearer ${token}`,
         },
-        body: JSON.stringify({ petName, species, breed: breed || null }),
+        body: JSON.stringify({ petName, species, breed: breed || null, petAge: Number(petAge) }),
       });
 
       if (!res.ok) {
@@ -485,6 +488,19 @@ if (user?.role === "CUSTOMER" || user?.role === "ADMIN") {
                   ))}
                 </select>
               </label>
+              <label className="appt-label">
+                Age (years)
+                <select
+                  className="appt-select"
+                  value={petAge}
+                  onChange={(e) => setPetAge(e.target.value)}
+                  required
+                >
+                  {Array.from({ length: 20 }, (_, i) => i + 1).map((n) => (
+                    <option key={n} value={n}>{n}</option>
+                  ))}
+                </select>
+              </label>
               <div className="profile-pet-form-actions">
                 <button type="submit" className="appt-submit-btn" disabled={submitting}>
                   {submitting ? "Saving..." : editingPet ? "Save Changes" : "Add Pet"}
@@ -531,6 +547,7 @@ if (user?.role === "CUSTOMER" || user?.role === "ADMIN") {
                     <span className="profile-pet-card-name">{pet.petName}</span>
                     <span className="profile-pet-card-detail">{pet.species}</span>
                     {pet.breed && <span className="profile-pet-card-detail">{pet.breed}</span>}
+                    {pet.petAge != null && <span className="profile-pet-card-detail">Age: {pet.petAge === 0 ? "< 1 yr" : `${pet.petAge} yr${pet.petAge !== 1 ? "s" : ""}`}</span>}
                   </div>
                   <div className="profile-pet-card-actions">
                     <button type="button" className="profile-pet-edit-btn" onClick={() => openEditForm(pet)}>Edit</button>