The phrase "childhood idol" refers to a person, often a famous or admired figure, who a person looks up to and admires during their younger years. Full definition
Also in 1966, Schwarzenegger had the opportunity to meet childhood idol Reg Park, who became his friend and mentor. (simplyshredded.com)
Thanks, Your Honor Twenty - five years after their first meeting, the author finds he chose a worthy childhood idol in Alan Page (si.com)
But more likely the particular moustache Orwell had in mind belonged to the erstwhile hero of British Victorian imperialism, Field Marshal Herbert Horatio Kitchener, his childhood idol, who was renowned for his chiseled features, penetrating gaze, and luxuriant moustache. (businessinsider.com)