Yes they have seniors hours started at 8:00 am
No but if you go in the early afternoon, after the lunch rush, this is a good time. Also going in the early evening an hour or two before they close... Parking lot is darn near empty and the warehouse has few customers inside!
No they don have senior citizen hours
https://www.google.com/search?q=costco+senior+citizen+hours&oq=cisyco+senior+ci&aqs=chrome.1.69i57j0i13i457j0i13l3.4576j0j9&client=ms-android-verizon&sourceid=chrome-mobile&ie=UTF-8
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