wondering if i will be allowed into japan because of my past experiences with cannabis as a minor

(Australian)although i have read that you will be denied access to Japan if you have been convicted of any drug related crime regardless of sentence, i was wondering if it differs with age or the fact that i got a “caution”, when i was 16 me and my friend were found smoking weed in a park, we weren’t carrying enough to be taken anywhere and all they did was take it off us and send us home, but i did receive a “cannabis caution”. Will this caution affect me being allowed in to Japan?