How old is Geri Horner, aka Geri Halliwell? According to Spice Girl Melanie B lying with the British singer about her age. She says that Geri in the past was also the reason that has increased by that figure, and actually no one would know how the fork exactly in the stalk. Although Mel B says that no one her age knows, in any document about Geri to read that the singer, now 46. But whether or not that’s true, is therefore questionable.