I feel there is an issue, with the third paragraph, which purely revolves around starting each sentence with "A". You might have six sentences in a paragraph which are perfectly correct, but when each starts in the same way the reader can either become irritated by it, or lose interest. Sometimes this can be solved by restructuring, rephrasing or, by editing and joining sentences together. I have tried the last of these methods, to keep the writing as close to your original as possible.
"A tootles old man": I have no idea what "tootles" means in this context. Is it a typo? If you explain what you mean by this I may be able to come up with a suitable English word for you. I know "tootle" means to either casually make noises using a trumpet or similar instrument, or to travel in a leisurely fashion, so for example "he tootles along in his car", but I have no idea how that can work in the given scenario.
Student or Learner