My old man: The truth about men's biological clocks Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email Evidence has been found suggesting that men have a sell by date regarding reproduction. ( Flickr user mtsofan (cc: by-nc-sa) ) Hosted by Femi Oke Produced by New York Times, PRI and WNYC