Women in their mid20s require a different conversational style. While women in the 18-21 age range easily get bored with topics that you drill down too deep, probing women in their mid20s with questions that drill down on a topic will get you in.
Women in their mid20s will also require a different energy level from you. While 18-21 year old girls will appreciate high energy in your sarges, women in their mid20s (generally speaking because there are exceptions) will require a toned down vibe in your energy.
The way you dress will also affect your sarges in your target age group as well as the way you handle your finances. With women in the 18-21 age range, you can easily bounce them to a street corner for some street food that costs less than US $1. For women in their mid20s, you'll need to spend more to properly isolate.
I won't advise spending an arm and a leg in a 5 star hotel dinner. You'll have to calibrate your sarge spends according to the typical price range your target women are used to or according to their social class. Spend more than what they are used to and you set up yourself for failure. Spend less than what they are used to then you set yourself up for failure also.
Nice guys spend all the time. This is bad spending. Spending on women to bribe them towards an outcome will not get you the desired result. Casually spending to
isolate within a girl's comfortable price range (I call this propinquity spending) will do the trick according to your target women's age range. Spending according to your terms (only when you feel like spending and at random) will get you the results.
Letting the girl reciprocate and encouraging her to be generous with you in terms of her time, money and effort will do the trick. Let her spend on you. Let her do things for you. Girls in your target age range are more generous compared with the 18-21 year olds.
Buying gifts to get in is a no, no. Buying gifts to get out, makes sure that you will minimize stalkers down the line. Women in your age range tend to be clingy and are prone to stalking (generally speaking because there are exceptions).
Likewise, women in your target age range will most often have more money compared with the 18-21 year olds. The places where they hangout will tend to be more costly and their hobbies as well will cost more than what the 18-21 year olds are used to (generally speaking because there are exceptions).
One effective way that will help you a lot is to observe how women in your target age range behave. They will have a different set of body language compared with the younger women. When you get comfortable reading their nonverbal language, it will be easier for you to calibrate and escalate.
One last thing, women in their mid20s are easier to f-close than the 18-21 year olds.

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Approach. Open. Escalate. Isolate
Here are my two essential rules on texting that will save you tons of time and money:
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