Dr. Vegas, I've been frequenting vegas for over 2 decades and I think you pose a great question, it's a bridge as men we all cross. It aint happenin' with the 18-25's anymore, either because they're too young and immature for us, no common ground for us to relate to (yeah right), more realistically it's because we're now viewed as that old dude trying to score young tail.
With that established and accepted what to do after a long day in the book or playing cards? What you don't want to do is settle in at one spot, i.e. a bar, club, etc. All of the clubs will be filled with 20somethings. The older women that are there are with their men, the milfs and 30's are burned out on the club scene, so you're wasting time at clubs. When you're home in your local town, that's what you do, look for the "hot spot". When in Vegas, you don't want to limit your odds to the drunkards in one bar, battling for the same piece of tail that every other hawk in the bar is on. The action is on the streets, flowing in and out of the casinos.
Here's a suggestion. Right outside the Piano Bar at Harrah's is the Carnavale Bar. Ladies start drinking there at 1pm. Party is going on until 3am. There is a nice, friendly walk to be had from the Carnavale Bar down to the corner of Buffalo Bill's. THERE ARE ALWAYS women, nothing but women walking to and fro. After 10pm, the only difference is the heels are on and the women are drunk. On your walk you can head over to Caesars and check out the skirts and hangers on over at Pure. Lot's of girls end up seeing the line and look to make other plans.
If you have no luck scoring on your walk, not to worry at all..... Drai's after hours at Buffalo Bill's starts around 4 am, and it is ALWAYS a party in there. Nice ladies, grown-ups in the house, party just keeps on goin.......
Good luck