十来岁情窦开不成气候
[shí lái suì qíng dòu kāi bù chéng qì hòu]
'Ten-year-old romantic feelings that never blossomed enough to change anything.' This conveys experiences about adolescence crushes/infatuations that remained immature hence did not lead anywhere consequential nor significantly impacted on development. In a nutshell expressing a feeling of naivety and immaturity at early stages of love or passion. Note that numbers aren’t strictly accurate - it may suggest a range from say 10-13ish.