On Turning Ten' by Billy Collins uniquely presents the theme of adolescence. It is also a “coming of age” poem that talks about the mental and physical changes during the juncture between childhood and teenage. When the poet turned ten, things started to change around him. WHAT CAN YOU INFER CITE EVIDENCE

(8) You tell me it is too early to be looking back, [9] but that is because you have forgotten
(10) the perfect simplicity of being one
(11) and the beautiful complexity introduced by two.
(12) But I can lie on my bed and remember every digit
(13) At four I was an arabian wizard.
(14 I could make myself invisible.
(15) by drinking a glass of milk a certain way. [16] At seven I was a soldier, at nine a prince.​