I've never done it, but one of my Aunts had both of hers done at once when she was 55. She checked herself into a rehab place for 2 weeks after surgery since she would've been alone at home. They worked with her so she could do what she needed to get buy at home. After she went home, therapy continued. Now, 5 years later, she says it was the best decision she ever made. She can do just about anything she wants and is pain free for the first time in ages.
Good luck.