If you make it to 90 years of age it might become too much to be coming and going. How much will you be paying in Tax and is all this travelling worthwhile and regardless of what's been said we don't even know if or it will happen Yet.
Disposable income is a big factor, most Thai's have none so you would need to try for the farang option, which is finnicky, static and unreliable and beside a Thai business partner is required. What sort of business, for starters experience in what you're going to run would be an advantage.