Numbers 3:22
Those who were numbered of them, the males from one month old and over, were seven thousand, five hundred.
Numbers 4:38-40
And those of the sons of Gershon who were numbered by families,
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Summary
                            Those that were numbered of them, according to the number of all the males, from a month old and upward, even those that were numbered of them were seven thousand and five hundred.                        
                    From a month old
General references
Bible References
From a month old
                                        Numbers 4:38                                        
                                                            
                        And those of the sons of Gershon who were numbered by families,
                                    General references
                                        Numbers 3:15                                        
                                                                                                                                Let all the children of Levi be numbered by their families and their fathers' houses; let every male of a month old and over be numbered.
                                    
                                        Joshua 21:6                                        
                                                            
                        The children of Gershon by their families were given thirteen towns from the tribes of Issachar and Asher and Naphtali and the half-tribe of Manasseh which was in Bashan.