Most u-19 teams form India if you see; the kids mostly come from big cities- Mumbai, Bangalore, Delhi etc so most cases their birth certificates are legit. Yeah, in IPL, domestics etc you might see someone crack the team from the more interior areas or remote areas. The current captain of the U19 team is also from UP.The age fudging is not exclusive to UP/Bihar but is also prevalent in other states like Punjab, Haryana, Rajasthan, Jharkhand, Bengal and some Northeastern states.