I know people who have gotten 5 or 6 single entry Non-O visas from Vientiane and gotten 60 day extensions in country between them and they never had a problem
BUT
I don't know anyone who would get a 90 day single entry Non-O based on retirement (seeing as most consulates around here to issue that visa require a police back ground check, a medical certificate, proof of funds AND a letter from your consulate stating you're retired)
@Da***
what's the reason you'd want to get them over and over like that?