It's never too late to learn. The Septuagint and New Testament were both written in Koine Greek (the every day use of Greek back then around the entire Mediterranean, after the conquests and Hellenization of the area by Alexander the Great), which strongly correlates to modern Greek. It's a still living language, and there are tons of resources, in books and online, to study and learn it. It's helped me a lot in my first read through of the Bible, too, as going back and looking at the original Greek, and analyzing what each word means, helps to understand specific sections I've had trouble with.