Do soft plastics have a shelf life?

[ErnieLearns]

Maybe not the right spot for this topic. but do soft plastics that are scent-infused or salt impregnated have a shelf life?  A lot of other items like medication and sunscreen have a shelf life because the chemicals eventually may start breaking down.  I'm still using soft-plastics with 2011 that I wrote on the bags.  They are stored in a cold garage in the winter and its hot in the summer.  They seem fine, but has anyone seen this topic anywhere?

[HB2]

Actually yes. You are not suppose to use any soft plastics that are more than a year old. As luck has it I am certified to dispose of any and all old plastic baits. Just Stick them in a bag w/ my $ 20 fee and I will dispose of them for you. But wait there is more ! Any old outdated fishing rods or reels I can also take care of for  free . Just Pay additional handling  .