Hi, two tone! I'm eight days out from surgery (it was Wednesday the 17th), and I can assure you that this is very do-able. I'm also 53, and, like you, was advised by default to get a mechanical valve. I said, thanks very much, but a) I'm not interested in being on blood thinners for the rest of my life, and b) I'm confident that percutaneous (catheter) approaches will be mainstream by the time I need a re-replacement, obviating the need for a second OHS. I received an Edwards bovine tissue valve and couldn't be happier. My surgeon even took the time to fit me with a larger valve size to ensure that percutaneous replacement would work well. It took an extra TEE in the OR to get everything just right, but IHO was well worth it.
It's ultimately your decision, but I just wanted to be sure that you know that doctors are often very receptive to hearing your thoughts and preferences. Unless mechanical is what YOU want, don't feel that you have to get one just because a doctor said so.
Keep a positive attitude, hang out here lots, and you'll do great!
All the best,
Jane