I am not aware of specific autoethnographies of middle-aged HE students. However, as a relatively new HE practitioner of similar age, I have used autoethnography to make sense (in an HE context) of my own experiences in entrepreneurship. There may be some insight for you in a working paper (now a Chapter in my new book)...
Preprint Working Paper: Storying the entrepreneurial call-On motivati...
Thanks a lot David, this is so kind of you. I will go through your article and surely it will be of great value , and it will help me understand autoethnography method even more.