I had the same surgery at 41. St Jude 21 mm valve and valve conduit. My surgeon told me younger patients feel it a little more (particularly if you are lean), but just like childbirth you will not remember that later! I found the first few weeks to be difficult, but then you really turn a corner. Cardiac rehab is key. Hopefully you will have nurses that let you challenge yourself! I feel like I was I better shape 12 weeks out than I am now lol! This board is a fantastic resource. And start home testing your INR as soon as they let you. Usually after 3 months.