I am a 21 year old and I want to date an older man. Where do I look?

So I am a attractive 21 year old female and am looking for an older guy. 27 and older. I am just so tired of young guys. They dont know what they want, It drives me crazy. Their level of maturity is an issue too.( I am not saying all, so please dont get offended) I choose older men because they can mentally challenge me and they know what they want in life. I also am a big traveler, and most young guys cant afford leisure trips. So I live in central california and cant find any attractive single older men. I might be looking in the wrong ares. What do you advise? Also what is the best way to approach older men?