Recovery email no longer active

Hello,
I was trying to get back into my account, ***@***. I entered my correct password, but it is prompting to send a confirmation code to my recovery email account which I no longer have access to (it was my college student account a couple years back).

I had some very sentimental emails I wanted on my old account. How can I prove I am the owner of the account so I can access it again, without having access to my recovery account?

My yahoo account is ***@***
However, since I cannot access it, you will need to contact me at my gmail account which is: ***@***