I've been a programmer (mostly) for the past 25 + years.
At 16 I wrote my first computer game, love it and then... Stopped.
Used Fortran, Cobol and stuff and eventually Java Enterprise stuff.
Realised I HATED IT!!
At 46 decided games were my passion (should have continued from my first game at 16).
Fast forward 3 years I feel proficient in Objective-C, Cocos2D and other game frameworks - I absolutely love it. 3 published games later and a pile of other stuff - Having the time of my life.
Do what you love is all I can say to anyone readying this.
And if you want to learn IOS there is NO BETTER COURSE out there (yeah I like capital letters) than the free Stanford CS193P course on iTunes - Google it.
Paul Hegarty rocks as an instructor.
Embrace it, I am living proof its never too late!