In our 33+ years of tandeming have seen less than 10 couples whereby the female captains.
As stated above, usually the taller larger/stronger person is the pilot.
Have seen a couple females captaining their spouses that were blind, including one couple going full-tilt on the outdoor velodrome in Kenosha, WI
.Being in your 70s does not stop anyone from tandeming. We are 77/75.
Go for it!
Pedal on TWOgether!
Rudy and Kay/zonatandem