Here is step to add filters:

Step 1: Enable Variants

1. Go to Sales app.
2. Go to Configuration → Settings.
3. Enable Variants (under Products section).
4. Save.

Create Product Attributes

1. Go to Sales → Products → Product Attributes.
2. Click Create:
   • Name: Color (or Age, Size, etc.)
   • Display Type: Select (dropdown) or Color (for color boxes).
   • Add values like Red, Blue, Green.

Repeat for each attribute (Age, Size, etc.).

Step 3: Assign Attributes to Products

1. Go to Sales → Products → Products.
2. Open a product.
3. Scroll to Variants tab.
4. Click Add an Attribute.
   • Select attribute: e.g., Color.
   • Add the values applicable to this product.
5. Save.

i hope it is usefull