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):
âBabies who are born prematurely often have two ages: Chronological age is the age of the baby from the day of birthâthe number of days, weeks or years old the baby actually has been in the outside world. Adjusted age is the developmental age of the baby based on his due date. To calculate adjusted age, you take your premature babyâs chronological age (for example, 20 weeks) and subtract the number of weeks premature the baby was (born 6 weeks early). In this example, the babyâs adjusted age would be 14 weeks.