This may help you. Scroll down past the South Point info. Also, pretty sure Boyd properties have various senior discounts. I guess I didn't read far enough down. They list Boyds discounts. http://www.casinocenter.com/strip-search-getting-the-most-from-your-vegas-vacation/
We have some senior specials listed on our site: http://lasvegasforbeginners.squarespace.com/senior-specials/
Just FYI, the lv premium outlets (south and north also) offer senior discounts for people over 50 on tuesdays! But be aware that some stores are not part of this special, I found out the hard way. Also be aware that some stores do not have this discount on sale items. Ross also offers senior discounts. I wasn't sure what kind of discounts you were looking for, hotel rates, stores or whatever. As others have mentioned, some hotels offer discounts but you may have to call them as they may not mention it on their web sites.
Four Queens Club 55 offers 20% off Hugo's, Magnolias, & Chicago Brewing. Ellis Island has drawings on Tues & Thurs, and you can get a free beer & $1 off meal coupons from the kiosk. Thurs also has 2-4-1 slices & pies from Metro Pizza for everyone. I read somewhere that Hard Rock has added some Senior specials, but haven't found any details yet. Have fun & good luck! -
On the Hard Rock website, go to "Game"tab, then "Promotions", and look at the 45+ Classic Rocker's Program. They offer 15X Reels & 7X Video Poker, and if you get 50 base slot points you win a free 6-pack of Coke. Promos run Monday - Thursday.