Thanks for your very relevant question.
All the published studies from LMIC (including several large series from India) have shown that the average age at diagnosis of CML patients is at least one decade earlier as compared to the west.
As pointed out by Dr. Gale and from one population-based cancer register from Mumbai, the age-adjusted incidence rates may not too difference between regions.
Without doubt the AAIR is more scientific than crude incidence rates.
Still the fact remains, that there are a very large number of young patients in LMICs and dealing with them, especially fertility & pregnancy issues, issues of long-tern TKI toxicities and issues related to TFR, become significant & need special attention.
Hope this helps.
Best wishes.