Psycholinguists believe that there is no such limit, and time is only one thing that can limit a person. In addition, if we understand the general laws of language, study becomes easier with each subsequent language. You might be interested to know about a polyglot named Ken Hale. It is believed that a professor at the University of Massachusetts knew about 50 languages and could speak all of them. Hale said that he knows only three languages. Its native English, Spanish and Warlpiri (the language of one of the Australian tribes). He could reasonably speak in the remaining 47 languages. He considered that the real knowledge of the language is an understanding of all the subtleties, semantic and stylistic nuances.
