Sounds like you can get around fine, but you are doing exactly what others are doing. Do you really(?) need such a heavy cruiser for what you are doing. Cruising the coast an a couple of trips a year doesn't require a heavy displacement boat...
A couple of people at my marina are the proud owners of the "tanks" of the sea. They bought them in the hopes that 10 - 15 years from now, they will be sailing around the world with it... Well, for the day or overnight sail, they complain about how much work it is.
A 42 footer is a handful when single handing when younger, but at 74? It sounds good to keep saying positive reinforcement phrases, but let's be real. Could your wife handle it completely, and I mean completely, alone if you get hurt? YOU might be able to handle it alone, but could she if needed? If you fall and are out of it, could she bring it to the dock completely without the help of another? And I mean all on her own... No daring rescue at the last moment. No knight in shining armour riding his dingy in a hurricane to rescue the 2 of you. Just her bringing it to the dock, that will answer your question if you need a smaller boat or not. Accidents rarely happen in blue skies and fair winds with mild seas...
You're sailing for 2, it's not just you... I'm assuming she is in the same age group... A 42 footer may be quite the handful for a 70 something year old lady...
The real question is "do you need a heavy displacement boat for the occasional outing?"
No one likes the idea of starting over with a new boat, but a heavy cruiser that's sorted out shouldn't be hard to get rid of. A nice sorted out coastal cruiser are out there.