In-Vitro Knowledge?

Devon • She loved three things - a good joke, a glass of wine, & a handsome man.
Hey, Ladies. 
So, my husband and I cannot naturally conceive due to him having cancer while he was young. The radiation therapy made him sterile. 
(Thanks to God, he's been in remission for about 12/13 years now!) 
Anyway, we were talking about doing in-vitro, since some of his sperm was stored before he started treatment, but that was a long time ago & it will be a while before we are ready to have children. Though I would not complain if a miracle happened & I became pregnant now. 
Does anyone know if sperm can "go bad" after a certain amount of time? I read that it can, and just wanted to see if any ladies with knowledge of the procedure could tell me anything. If you would also like to include any other facts you feel are important, feel free. 
Thank you!!