Hi, you are definitely never too old, I was older than you when I decided to come into this industry. I cant stress enough on the importance of following the apprenticeship route. There is a massive ammount of technical certificates to be gained out there all backed by C&G ,Bpec, NIC. But the only one that counts is the work related qualifications ie C&G 6189 -11 And then onto the level 3 which leads to your ACS.(gas) if you choose. As stated by others employers wont recognise technical certs. The private colleges will charge a fortune. Go back to basics knock on doors and get an apprenticeship, sit in college with all the kids, I did, you will learn how to do things properly. Find somebody local to shadow, the experience is priceless. Hope this helps.