<P> Age Ain't Nothing But a Number received generally favorable reviews from music critics, some writers noted that Aaliyah's "silky vocals" and "sultry voice" blended with Kelly's new jack swing helped define R&B in the 1990s . Her sound was also compared to that of female quartet En Vogue . Christopher John Farley of Time magazine described the album as a "beautifully restrained work", noting that Aaliyah's "girlish, breathy vocals rode calmly on R. Kelly's rough beats". Stephen Thomas Erlewine of Allmusic felt that the album had its "share of filler," but described the singles as "slyly seductive ." He also claimed that the songs on the album were "frequently better" than that of Kelly's first studio album, 12 Play . Paul Verna from Billboard praised both R. Kelly's Production on the album and Aaliyah's voice saying "The golden production touch of mentor R. Kelly is strongly felt here, and he has a field day with Aaliyah's warm silky voice, which has a depth and range that belie her youth ." </P> <P> Age Ain't Nothing but a Number debuted at number 24 on the Billboard 200 chart, selling 74,000 copies in its first week . The album ultimately peaked at number 18 on the chart . On the top r&b / hip hop albums chart the album reached its peak at number 3 on July 2nd, 1994 It sold three million copies in the United States and 6 million copies worldwide . In Canada, the album debuted at number 29, peaked at number 20 and spent 25 weeks at the chart, selling over 50,000 copies and was certified gold by the CRIA . It also peaked at number 44 on the Dutch Albums Chart; it peaked at number 23 on the UK Albums Chart, where it was certified Gold by the BPI . </P> <P> All songs were written and produced by R. Kelly, except for "At Your Best (You Are Love)", written by Ernie Isley, Marvin Isley, O'Kelly Isley, Jr., Ronald Isley and Chris Jasper . </P> <Table> <Tr> <Th_colspan="3"> Standard edition </Th> </Tr> <Tr> <Th> No . </Th> <Th> Title </Th> <Th> Length </Th> </Tr> <Tr> <Td> 1 . </Td> <Td> "Intro" </Td> <Td> 1: 30 </Td> </Tr> <Tr> <Td> 2 . </Td> <Td> "Throw Your Hands Up" </Td> <Td> 3: 34 </Td> </Tr> <Tr> <Td> 3 . </Td> <Td> "Back & Forth" </Td> <Td> 3: 51 </Td> </Tr> <Tr> <Td> 4 . </Td> <Td> "Age Ain't Nothing but a Number" </Td> <Td> 4: 13 </Td> </Tr> <Tr> <Td> 5 . </Td> <Td> "Down with the Clique" </Td> <Td> 3: 24 </Td> </Tr> <Tr> <Td> 6 . </Td> <Td> "At Your Best (You Are Love)" </Td> <Td> 4: 51 </Td> </Tr> <Tr> <Td> 7 . </Td> <Td> "No One Knows How to Love Me Quite Like You Do" </Td> <Td> 4: 07 </Td> </Tr> <Tr> <Td> 8 . </Td> <Td> "I'm So into You" </Td> <Td> 3: 25 </Td> </Tr> <Tr> <Td> 9 . </Td> <Td> "Street Thing" </Td> <Td> 4: 58 </Td> </Tr> <Tr> <Td> 10 . </Td> <Td> "Young Nation" </Td> <Td> 4: 40 </Td> </Tr> <Tr> <Td> 11 . </Td> <Td> "Old School" </Td> <Td> 3: 17 </Td> </Tr> <Tr> <Td> 12 . </Td> <Td> "I'm Down" </Td> <Td> 3: 16 </Td> </Tr> </Table>

Who wrote age aint nothing but a number