Hi there, welcome to the forum. I started this when I was 46 so I know what you are going through. If it just feels tight you probably just need to rest it. Make sure you are doing your warm up sets as well.
I use a technique called stretch lying (see the link below) pretty much all of the time. It's really just about putting your hips and spine in a normal anatomical position ... I think it really helps me maximize recovery. There's a book (you should see a link after clicking this link) that goes into the technique as well as other techniques to use when standing or sitting or bending over. This might all be more than you need but I've benefited from all of it... even to the point of adding a quarter inch to my height (consistent with the claim in the book). I suggest you try following my description of it and buy the book if you want to get into it.
This is just my recommendation, so I hope you get some others and can find something that helps.
http://www.startingstrength.com/reso...d.php?p=111551