The age of Hanuman when he received his powers from Lord Shiva or Lord Shiva's blessings is not specifically mentioned in Hindu scriptures like the Ramayana. Hanuman's exact age at the time of receiving his powers is a matter of interpretation and may vary in different versions of the story or beliefs within Hinduism.
In the Ramayana, it is mentioned that Hanuman was a devoted follower of Lord Rama and a prominent character in Lord Rama's quest to rescue his wife, Sita, from the demon king Ravana. During his journey to find Sita, Hanuman's devotion and unwavering faith in Lord Rama were paramount in his accomplishments.
Hanuman's extraordinary abilities, including his ability to change size and his immense strength, are often attributed to his divine parentage. According to some beliefs, he is considered an avatar of Lord Shiva, which would mean that he possessed these powers from birth. However, the specific age at which he realized the full extent of his powers or received blessings may vary in different retellings and traditions.
In summary, while there are many stories and legends about Hanuman's powers and his connection to Lord Shiva, there is no universally accepted age at which he received these blessings. It can vary in different versions of the mythological narratives.