Is 5'11 normal for a 25 year old?

Yes, a height of 5'11" is considered normal for a 25-year-old, particularly in many Western countries where average male heights range from about 5'7" to 6'0". Height can vary significantly based on genetics, nutrition, and other factors, but 5'11" falls within the typical range for adult males. For females, this height would be above average.