Aging up your pets in Sims 4 can be a fun and rewarding experience, allowing you to watch them grow and develop through different stages of their lives. Whether you're looking to age up a puppy or kitten to adulthood, or you want to see your adult pet enter their elder years, this guide will walk you through the steps involved.

How Do You Age Up Pets in Sims 4?

Using the Birthday Cake

1. Place a Birthday Cake: The most common way to age up a pet in Sims 4 is by using a birthday cake. To do this, purchase a birthday cake from the Build/Buy catalog and place it on a counter or table in your home.

2. Light the Candles: Once the cake is placed, click on it and select the "Light Candles" option. This will bring all of your household members, including your pet, to the cake.

3. Have Your Pet Blow Out the Candles: When the candles are lit, click on your pet and select the "Blow Out Candles" option. This will cause your pet to age up to the next stage of their life.

Using the Age-Up Treat

1. Purchase the Age-Up Treat: If you don't have a birthday cake on hand, you can also use an age-up treat to age up your pet. These treats can be purchased from the Buy Mode catalog under the "Pet Items" section.

2. Give the Treat to Your Pet: Once you've purchased the age-up treat, click on your pet and select the "Give Treat" option. This will cause your pet to consume the treat and age up to the next stage of their life.

Using the Ambrosia Potion

1. Learn the Ambrosia Recipe: The Ambrosia potion is a special potion that can be used to instantly age up any Sim or pet. To learn the Ambrosia recipe, your Sim must have a high level of the Cooking skill and must have completed the "Master Chef" aspiration.

2. Gather the Ingredients: Once you've learned the Ambrosia recipe, you'll need to gather the following ingredients: a Death Flower, an Angelfish, and 10 servings of ambrosia salad.

3. Prepare the Potion: Once you have all of the ingredients, click on a cooking station and select the "Prepare Ambrosia" option. This will create the Ambrosia potion, which you can then use to age up your pet.