Standard font size for non-Latin scripts

For Latin fonts you typically see anywhere from 12-16px for the main body of text. Medium.com has 21px for article body text which is larger than most. GitHub has 12px for code. Twitter has 14px for tweet text. Quora and StackOverflow have 15px. Depends on the font as well, but not to a large degree.

However, when I view scripts like Devanagari as क ख ग घ ङ ..., or Chinese 诶 比 西 ..., I don't know if it is because I am not used to the script or what exactly, but it is difficult for me to see the curves in the characters precisely at the given font size (like listed in the first paragraph). So I'm wondering if there are standard ranges for font sizes for non-Latin scripts like Devangari, Chinese, Japanese, Hebrew, Greek, etc. So it is a bit easier to read. At about 18px I can start to see better, and about 24px is good for Devanagari and Chinese. Wondering at what size native readers read the script, given standard eyesight / glasses.