My wife and I are over 65 what is our tax allowance, I read I get a THB190k exemption is that on top of my allowance?

The 190k is on top of the 60k personal allowance.

The spouse allowance is if they are not working and you want to file jointly.

So if you and your wife are over 65

190k
60k
60k

THB310k of assessable income can be remitted before the tax brackets.

Plus any other deductions or allowances (like Thai medical insurance)

Then the first 150k is tax exempt. So you can in effect bring in 460k THB of foreign sourced income or assessable income and not pay tax.

You do have to file if the income is greater than 220k jointly.