In order to account for the difference in Test matches played, it is only fair to look at the percentage of players debuting prior to 23 and after the age of 30.
Bangladesh have the highest percentage of players debuting under 23, while England have the lowest percentage at just 27 percent.
When it comes to older players, South Africa lead the way with 14 percent of their debutantes aged 30 or older.
The percentages of Australia, South Africa and England are all very similar. It is perhaps not surprising that the Asian teams give the highest percentage of debuts to those 23 and under.