Re: Getting Started at 50
It's NEVER too late to start and 50 is pretty young. A few things to try/consider:
Spend time sailing small boats (Lasers, Thistles, etc.). I've seen a lot of folks who went directly to learning/sailing large cruisers miss out on the basic, intuitive interaction of wind and sail.
Join the nearest sailing club/association. They are usually filled with friendly, like-minded folks.
Go to events like Strictly Sail, Annapolis Boat Show, etc. While they have exhibits, lots of boats and gear, the workshops/educational seminars are most often excellent. They are also a good way of meeting people and learning about good places to go.
It's great that you and your wife share the same passion. Now plan some trips and get sailing.