As far as I am aware, you will still be in the age bracket for turbo prop airlines
You're still in the 'age bracket' for most airline jobs that may appear on your lists of wants/desires.
You just need to make allowances for the fact that you'll be joining a considerable 'heap' of licence holders after your training, in an industry that is making cuts on a large scale - in addition there are already many rated pilot's with many hours of experience on type who have lost, or will lose their jobs in the coming months, your claim to be first out of the blocks is somewhat ambitious !
I don't see any reason that at 40+, you're not as attractive, if not MORE attractive to an employer than someone half your age . . . You've still got 25 years work ahead of you, so I say go for it . . .