वन उपवन मग गिरि गृह माहीं, तुम्हरे बल हम डरपत नाहीं । Hanuman is commonly considered to be a "Chiranjivi," which implies an immortal remaining or 1 who life eternally in Hindu mythology. This position for a Chiranjivi is attributed to his exclusive and divine characteristics. Here is an explanation https://a-z-directory.com/listings13079462/rumored-buzz-on-hanuman-chalisa