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I think there were two sets of ages given for lions weighed by Dr. MacFarlane.
In the section of "Lion Measurements" you can see that before the measurements they mentioned the date of collaring and next to that, the age. I believe this was the estimated age at the time of collaring those lions.
And then in the section - "Chapter 3: Lions of Central Kalahari Game Reserve - General methods" there is another table with a column of age of lions and next to that a column of reason of death. I think this second column of age of lions is the estimated age at the time of their death.
Do correct me if I am wrong!
Let me check the document again and I will share my findings with you.