What's the age gap? Vaughan as Akram mentions Kamran Ghulam has 15 brothers and sisters

Former Pakistan captain Wasim Akram, while commentating in the first Australia-Pakistan ODI in Melbourne, mentioned that Pakistan all-rounder Kamran Ghulam has 15 brothers and sisters. Responding to him, ex-England captain Michael Vaughan said, "16 kids. Wow! What's the age gap? That's of interest." Meanwhile, Adam Gilchrist remarked, "Pakistan selection committee."