Afghanistan have given debuts to more teenagers in their test cricket history than England have
No. of teenage players for each side in tests (youngest player in brackets)
Pakistan - 54 (Hasan Raza 14 years 227 days)
India - 30 (Sachin Tendulkar 16 years 205 days)
Bangladesh - 29 (Mohammad Sharif 15 years 128 days)
West Indies - 20 (Derek Sealy 17 years 122 days)
New Zealand - 17 (Daniel Vettori 18 years 10 days)
Australia - 16 (Ian Craig, 17 years 239 days)
South Africa - 15 (Kwena Maphaka 18 years 270 days)
Sri Lanka - 14 (Sanjeewa Weerasinghe 17 years 189 days)
Zimbabwe - 14 (Hamilton Masakadza 17 years 352 days)
Afghanistan - 10 (Mujeeb ur Rahman 17 years 78 days)
England - 8 (Rehan Ahmed 18 years 126 days)
Ireland - 0 (Matthew Humphreys 20 years 208 days)
Also age related - no players have played for Afghanistan, Bangladesh or Ireland after hitting age 40. And 53/106 40+ players have been English.