Mike,
this is a common question; we have even had requests for a separate forum for the 'senior' wannabes!
Given that you appreciate the minor learning problems that go with increasing age, and the fact that the majority of your peers will be in their early 20s, there are actually no barriers to beginning commercial aviation training at your age. You should appreciate that your late start reduces your chances of reaching Concorde command but, that said (and it was with tongue in cheek), you have every chance of making heavy jet command - you'll just have less time to enjoy it once you're there!
You obviously also understand that this isn't the best time in history to be contemplating a career in aviation, but nothing's ever perfect.
I wish you the best of luck!