Not that there's any age-ism in our field but ... a few years back I read a post (likely on LI, but I can't be sure; memory's the 2nd thing to go you know) about how to write a resume that doesn't divulge your age. Lose the double-spaces was number 1. Along with omitting a snail-mail address and of course the date of your University graduation.
Those of us who have been doing this for awhile will also leave off the side job we had in school overclocking Apple II's, and other ancient history. If done correctly they won't distinguish yours from someone whose career began when your reverse cron CV ends.
By the time you show up in that suit & tie you haven't worn since your niece's 2nd wedding they will hopefully be invested enough in your skills to look beyond your attire and the grey beard.