I got into the computer industry at 40. Went to a specialized school to get training -- but it had a good rep in the area for placement. Being female, I had the triple whammy: an old, female newbie. I didn't have that great of a job before, but my longevity had gotten me decent pay for the type of work. Within 1 year I was making more than I had after 15 in my previous job, and now am making more than twice that! I have not gotten any certifications - still studying. But my company does have incentive plans for certifications .
What I have learned from the change: Don't get into the tech field because you think you can make bucks. You have to have the aptitude and temperment and enjoy the work. Talk to people who do the kind of work you're interested in -- find out how they really spend their time, and how much time doing their job. Ask what they would change about their job, what they hate, what they like. And be prepared to always read, study and new learn new -- in this line of work, if you don't keep up, you get left behind, FAST!