How old is simba in human years?

In the movie "The Lion King," Simba is depicted as a cub at the beginning and grows to adulthood by the end. If we consider his life stages, he is roughly 3-4 years old in human years when he is a cub and around 18-20 years old when he becomes an adult. However, it's important to note that the conversion of animal years to human years can vary widely depending on the species and context.