The answer is:
101 Crew Members
Each number is:
C = 4 U = 3 V = 3 W = 101 X = 17 Y = 7 Z = 37 33101177*37+4 = 4002331
My reasoning is:
The age of the captain has to be 64, which is 4 cubed, because 25 is too young to be a grandfather, and 125 is too old to live. The other numbers are just the 6 factors of 4002327, which I found by trial and error on my calculator, though there are probably more efficient ways of doing it!
Edit: Sorry I didn't put my answer into a spoiler, this was my first time on the Puzzling site. I figured it out for the future though!
Edit #2: added my reasoning.