Is there any age restriction for taking the PTE exam?

Absolutely No!, there are no such age restrictions for taking the PTE exam. There is no specified age restriction for individuals for taking the PTE exam. It is open to all individuals of all age groups who wish to manifest their English language proficiency for immigration or academic purposes.

Always keep in mind that each proficiency test, academic institutions or immigration authorities have their own rules & regulations, requirements & preferences, so it is preferable to check the specific criteria of the institutions you are applying to.