What are the best visa options for a Canadian senior looking to stay in Thailand for six months?

the easiest 6-months visa is the "multi entry 6-months Tourist Visa" applied by the E-Visa system in Canada. It does not require any financial proofs. . . . . you can apply for the METV every other year. Just don't stay in Thailand longer than 180 days per each holiday, as it would make you a tax resident of Thailand

DTV or Retirement visa if you are over 50

How long do you plan on staying. There can be Canadian tax benefits to making your residence in Thailand.

Go to Phillipines. More to see and friendlier English speaking hot chicks.

Currently the easiest to achieve what you want, without border bounces, would be DTV based on a "soft power", like muay thai or cooking classes.

You can stay 6 months every year for 5 years without border bounces.

Proof of 500k baht ( 20k cdn) one time proof for 5 years of visa.

As long as you come and go.

At this point you only need one course usually 3-6 months it seems and get 5 years, amazing deal.

Cost varies but about $400cdn visa and $800cdn for the courses seems to be what's reported.

You can come and go whenever you want and each time you enter its 6 months.

The courses have no follow up, so it's like a gym membership, if you don't go it doesn't matter.

It is a good way to do what you want, now, who knows if it stays that simple for the duration....

20 + years as a Canadian .

Multiple entry tourist visa is good up to 9 months .

I do 6 every year .

Two extensions ,one Cambodia in and back same day .

Easy

I'd ignore all the suggestions to get a retirement visa. If you're only looking for a 6 month stay, there's no reason to go to the effort - that's for retirees who want to stay at least a year. Also, it requires exchanging/transferring about $30,000CAD or proving you have enough monthly pension income. Really too much work if you're only planning on 6 months.

Right now there's still a visa free 60 day on arrival (can easily extend for another 30 days at any immigration office in Thailand). Normally if you leave to visit another country for a week and then return, you could do that a second time (6 months total). The 60 day is supposed to be going back down to 30 days though, so if that happens then maybe the DTV.

DVT for sure

You can get a multi entry tourist visa METV. Or just do nothing, enter visa exempt for 60 days and extend 30 days at immigration for a total of 90 days. Then exit the country and return for another 90

50+ season some money in a Thai bank account then non O retirement, renewable ever 12 months.

Non O based on retirement or a DTV. Look on the evisa website to see which one is suitable

The Non OA seems like a solid choice for you