This happens for most of the 90's kids because schooling or parents were not aware of it. To join school you should be 5 years, if the kid is around 4.5/8 teacher suggest to change date and also birth certificate was not complusory to get admition into school. due to this people have rigged the age (front/back).
Earlier Class 10th Certificate used to be the final document for age proof. Not sure about nowadays. Small kids below 14-15 can easily fudge the school records. Schools do not insist on Municipality/Hospital certificate either for Birth while giving admission. Hopefully with Aadhaar card system, Class 10th birth certificate will be removed and age proof will be more genuine from childhood only.
Calf is not at all an indicator for age... even if one doesn't play football one ends up have a swollen looking big calf..it is because of walking on a hilly terrain (uphill - less strain/downhill - more strain on the calf muscles).
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Hopefully with Aadhaar card system, Class 10th birth certificate will be removed and age proof will be more genuine from childhood only.
The main problem with indian mindset is we adjust to the blockages in the system not many care to protest or support those who does...
in the end these stuffs does make an effect in fields like sports