Of course, but you are not likely to speak like a Japanese person - maybe you will, after practicing for a lot of time and assuming your native language had mat

Of course, but you are not likely to speak like a Japanese person - maybe you will, after practicing for a lot of time and assuming your native language had matching sounds to Japanese (I don't know about Japanese but there are some guttural sounds in Greek you won't be able to learn as an adult unless you've been exposed to them as a child). Meanwhile a newborn would learn to speak like a native Japanese speaker in 3-5 years.