What is the best visa option for someone living in Thailand at age 50 who travels back to the UK three times a year and is married with children?

For someone who is 50 years old and is planning to live in Thailand while traveling back to the UK three times a year, the best visa options include the NON-O visa based on marriage if married to a Thai citizen, or the NON-O visa for retirement. Both options allow for extensions of stay and require a multi-entry re-entry permit. Additionally, the Thailand Privilege Visa is mentioned as an easier but more expensive alternative.