But otherwise you'd get a lot of age related deaths? If you use a 15 year window, many people with cancer treatment at the age of 70 won't survive the 15 year p

But otherwise you'd get a lot of age related deaths? If you use a 15 year window, many people with cancer treatment at the age of 70 won't survive the 15 year period. That makes cancers 'deadlier' where they affect older people. A 5 year horizon is probably more suitable to reduce unrelated deaths.