You can't teach an old dog new tricks.

老难学艺啊。

Also, we " can't teach an old dog new tricks" .

还有，我们“老难学艺”。

First, let's explore the subject of aging more.

我们先来探讨一下关于老的问题。

Two bulls! A young one and an old one.

两头公牛！一头轻，一头老。

And because of crippling old age, he could no longer carry himself.

由于老体衰，他再也不能自食其力了。

She keeps talking about her mother being infirm. But I'm infirm. Why doesn't she think about that?

她总说她的母亲如何老体弱，我还老体弱呢，她怎么没想到？

Are people's mental abilities affected by old age?

人们的心智能力会受老的影响吗？

" Older black ladies make the best iced tea" .

老的黑人女性做的冰茶最好喝。

Old age saves us from the realization of a great many fears.

老让我们免于面恐怖的现实。

That they are often old and weak makes them even easier to push around.

她们通常老体弱，更容易受人摆布。

But what problems are associated with living until a ripe old age?

那么，人们老后会面临哪些居住问题呢？

We want people to be healthy even when they are old.

我们希望人们即使在老的时候也能保持健康。

Elderly people tend to be wise and for that reason, happier.

越老的人越明智，也就更幸福。

In the middle of the village lived old Dame Shoemaker.

在村子的正中央住着一个老的女鞋匠。

My interest in old growth took off in, oh, about 2003.

我老生长的兴趣起源于2003。

And the old wine had significantly higher sugar content.

而且这些陈老酒中含有非常高的糖。

Greater extroversion in young adulthood directly correlated with greater satisfaction later in life.

轻时候越外向的人，老之后满意度越高。

The old rabbit hopped in, but he did not say a word.

老的兔子跳了上来，但他却一句话也没说。

Then Billy Beaver called " Whoa! " He looked around at the old rabbit.

“停车！”他上下打量了一下这只老兔子。

'Who is that, madam? ' he asked the old housekeeper.

“太太，她是谁？”他问老的女管家。