What are some general tips for telling how old a woman is?

Anonymous
I have very little experience when it comes to dating... and when I say "little," I mean "none." It's embarrassing at my age, but there's no hiding from my inexperience.

One thing that I frequently worry about in regards to approaching women in public settings, just starting a conversation even, is that I have difficulty telling how old people are at a glance. What are some general guidelines to tell the difference between, say, a twenty-year-old and a twenty-six-year-old? The former is too young; I'd think four years younger to four years older than me would be an appropriate age range (I'm 27). Or am I overthinking this? Any help would be appreciated, I worry about this a lot.
What are some general tips for telling how old a woman is?
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