How old is Shido in Persona 5?

Can you please clarify the age of the protagonist, Shido, in the popular video game franchise Persona 5? As a fan of the series, I'm particularly intrigued by the character's backstory and development throughout the game. Additionally, is there any significance to his age in terms of the narrative or gameplay mechanics? I'm eager to learn more about this intriguing character and how his age might factor into his journey.