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1) Dress differently, wear dress shirts, add facial hair. Anything that makes you look older
2) I've lied about my age when a 24 year old HB8 (im 21) asked me my age I said I was 23
3) Correct body posture. Act mature. ETC
This all comes from assuming that there is something wrong with being young. Nothing good inner game cannot fix.
1. Why care about age, it is just a number. Sooner or later she is gonna find out that it is just a baby in a suit. How annoying is that? Get some real experience instead of faking it.
2. You really lied about being 3 years younger? Come on. 3 years is nothing, especially if you are over 21.
3. Again this is faking it. Growing up would be the answer to this question, why fake it when you can make it?
In conclusion, how do you seem mature? You become mature. As David DeAngelo said in his audio-course "The boy must die". Women of all ages want men, not boys.