Junior - I think you should say who sent you that letter in your first post! It's total, total garbage. There were several people on my course that were over 30, including myself and I think it is fair to say we massively outperformed the youngsters as a group. Each and every old bloke on my course got a good job too - all on jets.
Experience, attitude and desire to succeed are important factors in ATPL success and from what I've seen (I'm generalising) these seem to be qualities that older people can bring to the table. Don't let anyone tell you you're too old. I started at age 32 in 2006 and am now in a great job in the left hand seat of a modern jet.