Why the crude mortality rate is lower in haiti than in the US?

US is more populated, now the bay boomers are aging, the US has more proportion of old person than

The infant motality rate in Haity is 54

The child mortality rate in Haiti is 72

The Infant Mortality Rate in USA is in 2008, 6.7 infants died per 1000 live births.

The USA has the high crude mortality rate compare to Haiti crude mortality rate in the year 2000 is as a result of a higher proportion of old persons. And to avoid this problem, one should use age-standardized mortality rates.