there are heavy odds in favour of our dying between the ages

直译：在60到80岁之间的时候,有很大的概率发生死亡.
一般意译为,我们在60岁到80岁之间死亡的可能性很大.
【in favor of】支持,有利于
【odds in favor of 】引申为：一件事情的发生的概率
odds in favor of our dying 死亡概率
在朗文词典中,odds词条里有这样的说明：
【possibility】
the odds against / in favor of
I'm afraid that the [odds] are heavily [against] her winning (=it is not likely) .
The [odds] are [in favour of] a Russian victory (=it is likely) .
例句：
I reported to Nixon that the odds were two out of three in favor of a rapid conclusion of the war.
我向尼克松报告说迅速结束战争有六七成的希望.
thought the odds were in favor of your murder.
我认为你有谋杀的机会

赞成

这里应该不能直译吧，应该是 把握机会，为机会而战，积极争取的意思吧。

意思是：赞成