I don't know about visas but ignore all the commenters telling you to buckle up / settle down / get a job (which you already have!) You're young, just be smart, and somewhat sensible, and enjoy life!
If and when you decide to bring your wife to Thailand, I can recommend checking out Dok Kaew Gardens an excellent facility specializing in elderly and dementia care in a beautiful setting a bit outside of Chiang Mai. When I was there there was a mix of western and Thai people living in the "dementia wing".
If from visa exempt country, 30 day entry and extend at immigration for another 30 days. Or apply for 2 month tourist visa online and can also extend for 30 days in Thailand