I personally think about 14 or 15
It's hard to tell that early, but some doctors can catch it in time. Signs would be heart defects or growth delays.
The blood type of the person donating the kidney must be compatible with the recipients blood type
Benefits
Increased muscle mass: Muscle mass naturally decreases with age, but strength training can help reverse the trend.
Stronger bones: Strength training increases bone density and reduces the risk of fractures.
Joint flexibility: Strength training helps joints stay flexible and can reduce the symptoms of arthritis.
The questions I ask myself are
1. Is it on wikipedia? Obviously if it is don't take the advice
2. Who is the source written by? A doctor or someone who just googled symptoms?
3. When was it written? Medicine is always changing so the data could be out of date.
4. Is it from a .net .com .org .edu? Some are more reliable than others. You wouldn't want to listen to a . com as much as a .org because organizations are better than a community.
5. Does it make sense? Can you go to a doctor and not sound silly?