First, it depends on your country of passport. If you paid tax on that pension in your home counrty and that country has a dual tax agreement with Thailand (like USA, Great Britain, Australia, New ZSealand and many other countries) then it will not be subject to Taxation by Thailand.

@Kool ******

Not fine. He cannot get the visa before her is married.

@Joe ******

Before you can get a maariage visa (from a Thai Embassy/consulate) outside of Thailand or an extension of stay based on being married to a Thai (from an Immigration office inside of Thailand) you need to have your Thai marriage recognised by Thai authouities. Getting married in Thailand is a complicated process. The first step is to get a letter from your embassy stating that you are free to marry.

If your Thai licence has expired by over 1 year then you are not able to renew it, You must start the whole process again.

You must be legally married before applying for a marriage visa from outside of Thailand or for an extension of stay based on marriage from inside Thailand.

Heart medication is readily available in Thailand. But you may need a doctor to advise on local alternatives to ones you are using.

Should not be a problem. Even to get a medical certificate for Thai licence, there was no physical examination or questions from the doctor.

@Christopher ************

I did, last week for an Australiam man on a 30 day visa exempt stamp.

Not required for all visa types.

You should be able to open a bank account yourself, even if you are on a tourist visa or visa exempt stamp. All banks have different requirements. All branches have different requirements. Even within a branch two staff members may give very different answers. Find a branch of the bank you want (I use Bangkok Bank in Doi Saket), in an area with lots of foreigners. Go to the bank with your passport and a friend who holds an account at that branch. Have 100,000 thb to deposit. Should work but many banks/branches will also require a certificate of residence from Immigration. But instead, you could offer a letter from your hotel/ hostel/ Airbnb/ friends house stating that you stay there.