Unlike the video games, which feature Geralt carrying two swords, the books note Geralt’s second sword is in a pack on his horse, Roach. The photos have yet to confirm Roach’s existence but chances are good the horse is also involved in the series. As such, it will likely be revealed Geralt’s second sword in the pack Roach is carrying.
I’ve heard of old men married to much younger women dying from sex taxing their hearts too much, so that is more likely than you think.