According to Mayo Clinic, Down syndrome causes a distinct facial appearance, intellectual disability, developmental delays, and may be associated with thyroid or heart disease in a person. So calling people with this syndrome 'Mongoloid' is extremely vulgar and disrespectful to ethnic Mongolians. Likewise, how will the population react if Down Syndrome was associated with 'European' looks? If you use this term, you are automatically a xenophobic, in my opinion.
If any difference is noteworthy, it would probably be that an age is usually between two times, e.g. 1290-1450AD, whereas an era is less set - but that isn't a rule, its just a matter of usage. Synonyms would be epoch, or eon. Source(s):
Calculations. An ERA is calculated by adding up the earned runs and dividing the number by the number of innings pitched. That number is then multiplied by 9. For example, if a pitcher allowed 25 earned runs over 100 innings, you would divide 25 by 100 and then multiply by 9.The ERA would be 2.25.alculations. An ERA is calculated by adding up the earned runs and dividing the number by the number of innings pitched. That number is then multiplied by 9. For example, if a pitcher allowed 25 earned runs over 100 innings, you would divide 25 by 100 and then multiply by 9. The ERA would be 2.25.