Here is how I picture the heights and ages of the crew. The heights are based on how I draw them and ages are based on how they act in the series.
Heights (shortest to tallest)( age written behind character)
Franklin ( 1 year old)
Timmy (8 years old)
Angel (25 years old)
Mr. Cheese (33 years old)
Rose (25 years old)
Mr. Egg (35 years old)
Gnome ( 27 years old)
Goober (20 years old)
PoopyFarts (24 years old)
Engineer (26 years old)
Player (22 years old)
Mother (40 years old)
Bday (27 years old)
Greaser (30 years old)
Sheriff ( 27 years old)
Veteran (26 years old)
Blue (29 years old)
Stoner (31 years old)
Bro (24 years old)
Ninja (29 years old)
Captain ( 32 years old)
Gentleman (39 years old)