How do you flirt with "older" women?

Hi everybody. This is my first question which came up to my mind here and I'd like it to be answered.

Only few times I have approached older ladies in my life so far. I am 21 by the way and I mean I have approached girls between 25 to 30 years old. The biggest problem I have faced with while approaching them was their reason of rejection. Almost every girl of this age (25-30) told me she didn't want to bond with such a guy, who is younger and even immature. Between us, I lack some experience due to my young age. However, I don't think I am immature like some of my peers are. And want to show that to those girls too.

In conclusion, how shall I talk or more precisely how shall I flirt with a bit older girl in order to prevent her from getting myself typecast as someone not worth speaking to?

Thanks in advance for all your advice, opinions etc.

How do you flirt with "older" women?
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