Recovering ownership of a Blogger account or blog may be a frustrating process.
Recovering control of a long forgotten account or blog starts with having a token sent to the recovery email address. If you don't have access to the recovery email account, you may be able to use the Google Account recovery wizard - if you can at least provide the email address that you used long ago, and a few personal details.
But what if you don't remember the email address - or even the URL? Blogger won't just tell you what the address was - and they don't know who you are, so would do they know the URL of your blog?.
In the latter case, you may have to involve your friends - and some detective work.
Now, you hope that when you registered your Blogger account long ago, you provided an email address that you used for real life activity.
When you created the blog, you surely emailed the URL to somebody.
When you need to identify the email address used, long ago, for registering your Blogger account, think back. Who did you email, long ago, around that time, for serious discussions?
If you're lucky, one of your friends, carefully searching her / his email archives, can find your email - and provide the email address that you were using - and the URL of the blog.
Knowing the URL may jog your memory enough, to remember the password.
With help from your friend, and now knowing the email address, that may even help you remember the password that you may have used. If you're lucky, you may be able to use that email address and password, and finally recover control of the blog. Just don't spend a lot of time guessing, and cause account lock (aka "suspicious activity").
Now, with the BlogSpot URL, you can use "Forgot?", and reset the password.
Having recovered the email address, try the Google Account recovery wizard, again. This is your best bet. Without this, you're probably going to need to establish your identity using a court order, issued by a sitting judge.
An Important Update
If you did not use a Blogger / Google account when you Followed this blog, years ago, you are probably not Following now . During the past...