I'd like to write a memoir about my unique teenage adventures growing up in another country. Since this was ~35 years ago, I don't remember very many names. Is it ok to use pseudonyms? I presume that I would have to state that all referenced names are, in fact, made up. Thanks in advance!
Yes, of course.
But perhaps you'd want to say 'I can't quite remember his name, let's call him x' or something along those lines.
Make the reader aware that you are using a pseudonym and you're fine. Good luck!