pop singles chart. Internationally, "Back & Forth" became a top-forty hit in the United Kingdom and the Netherlands, peaking at numbers 16 and 38, respectively. In New Zealand, the song peaked at number 48. The album's second single "At Your Best (You Are Love)" was released on August 22, 1994, and it became Aaliyah's second top-ten hit on the Billboard Hot 100, peaking at number six. On the Hot R&B/Hip-Hop Songs, the song also reached the top ten, peaking at number two. The song received a gold certification by the RIAA on October 25, 1994. In other international markets, "At Your Best (You Are Love)" reached numbers 27, 38 and 40 in the UK, New Zealand and the Netherlands, respectively. "Age Ain't Nothing but a Number" was released as the third single and the final US single from the album. It peaked at number 75 on the Billboard Hot 100 on February 25, 1995. The song fared better on the UK charts, peaking at number 32, as well as at numbers 19 and six on the dance and R&B charts, respectively. The album's fifth and sixth singles "Down with the Clique" and "The Thing I Like" were released exclusively in the UK. "Down with the Clique" peaked at numbers 32, 25 and five on the official, dance and R&B charts, respectively. "The Thing I Like" peaked at numbers 33, 15 and four on the official, dance and R&B charts, respectively. Critical reception 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 debut 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