TT is a terrible determinant of age. There are plenty of low time guys in their 50s and high-time guys in their 20s and 30s. I'm pretty sure that people who spend all day looking at applicants know that...
I believe the whole "too much time" myth
comes frome the fact that as hours increase, the representative numbers in the applicant pool decrease. Therefore, fewer applicants are chosen at higher time because there's simply fewer of them. I highly doubt (and have yet to see proof) that it is being used as a discriminator.
At least I hope not.