We use as + adjective + as to compare things, people, places or events when there is no difference, use as + adjective + as:

• Dave is 23 years old. Julie is 23 years old. Julie is as old as Dave.

lets do more examples;

• Istanbul is as cold as Ankara in the winter.
• Andrea is as beautiful as Beyonce.
• Pasteur is as famous as Einstein.
• A snake is as dangerous as a crocodile.