Hello! Firstly, congratulations on your upcoming retirement and kudos to you and your husband for wanting to spend time traveling together! Secondly, while I may not have any experience teaching Spanish to older students (yet!), I know learning Spanish can be fun for all ages. As a person who is not a native speaker and whose parents do not speak Spanish I know firsthand the difficulty in acquiring a second language; I also understand the pitfalls that teachers experience in their struggles to relate the information to non-native speakers.
For a year I taught elementary school students, high school students, and teachers English education using cognates. Cognates are words in two languages that are spelled the same - or nearly the same - and have the same meaning. Using this strategy, teachers and students can hyperfocus in on the importance of correct pronunciation. This strategy is successful among my students, and I know if you and your husband are committed to learning and overcoming difficulties, it will be successful for you two as well.
If you are interested, we can establish a schedule and develop a curriculum together that can range from survival words and phrases to idioms to thorough grammar comprehension to cultural understanding depending on your priorities.
Let's get in touch! I look forward to hearing from you and suerte! (Good luck!)