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上面計晒, age 65 male IRR= 3.87%, based on Hong Kong Life Table 2017, no questions, thanks
And there could be mortality improvement...

, so potentially the IRR will be higher as future cashflows will be higher...
But anyway, 年金係比一班唔take得high risk 嘅廢老, 連登仔個個都係股神, 點會睇得上眼呢?