My guy says over 30.
If the woman is over 30 but looks younger than that he says , "young lady".
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I would say it is more of a relative term rather than a number. What I mean by that is that it depends on the namer's age vs the one being named.
Example: Let's say there is a woman who is 35. It would be very strange of me to say to call her a "young lady" considering I'm 19. However, an 85 year old person calling her "young lady" wouldn't be that odd in my opinion.
I think of calling someone "young lady" being used as a way of calling a girl significantly younger than you.
There is no age for it specifically, but I mean-- a human's lifespan is limited... So in that sense is limited.2