"Wait. You're 40?" Bo looked her friend over and the whistled. "You look good for 40." And really she shouldn't be so surprised as Dyson was way, way older, but still.
Other options:
no subject
"Wait. You're 40?" Bo looked her friend over and the whistled. "You look good for 40." And really she shouldn't be so surprised as Dyson was way, way older, but still.