How did you come up with that ? Now a days parents emphasise on girls to complete their education before getting married. I have many memon acquaintances , this community used to marry off their daughters as young as 16-18 years of age. But now I see so many memon girls completing their education , finding a good job before getting married.
You are suggesting that if a girl isn’t married by 30 then she has some sort of flaw. It’s all comes down to fate / naseeb. No one can get married before or after the tiem decided by ALLAH.