Yes. But at your age you may find it difficult to get insurance. However, there is a USD 100,000 option seasoned for at least 1 year. You will find everything here:
https://ltr.boi.go.th/
If you have any questions, send them an email. They are surprisingly alert and quick to reply.
For the "Wealthy Pensioner" option, see below taken from the website link above:
A. Health insurance policy (travel insurance NOT accepted) covering the entire course of stay in Thailand and providing at least 50,000 USD for hospitalization and medical treatment in Thailand with no less than 10 months of remaining coverage
OR
B. Evidence showing valid social security benefits insuring hospitalization and medical treatment in Thailand
OR
C. Financial evidence or bank statement (Investment portfolio NOT accepted) showing a deposit of no less than 100,000 USD which has been held and maintained for no less than 12 months at the time of application Note: Documents must be in Thai or English only, translated documents must be notarized Item A. can optionally be submitted later, in which case the applicant must submit a signed Document Request Acknowledgement Form in place of the actual document If chosen to do so, insurance documents will later be requested by the relevant government authority once the application status has been updated to: Consideration By Government Agencies