I'm not sure if this issue has been addressed before.

I was wondering to what extent aero bars would improve my time-trialing.
I'm pretty old, and weak. I have a regular 10 mile circuit I do, generally flat but with extended false flats, bumpy road surface, and a quite frequest cross-wind---that's my excuse anyway. I can't do much better than a little over 21 MPH and was wondering what improvement I could realistically expect using aero-bars.?

Regards

Brendan O'Sullivan