question #1 Sahih al-Bukhari 1858, Book 28, Hadith 38 : At what age is it permissible for a child to perform Hajj according to Islamic teachings?

(While in the company of my parents) I was made to perform Hajj with Allah’s Messenger (ﷺ) and I was a
seven-year-old boy then. (Fath-ul-Bari, p.443, Vol.4)