He wondered if perhaps he was getting old and losing his grip.

他怀疑自己或许在变老，对事情感到力不从心。

《柯林斯英汉双解大词典》

I think the Prime Minister may be losing his grip.

我认为首相可能控制不住局面了。

youdao

The manager seems to be losing his grip on the business.

经理似乎正在失去对企业的控制。

youdao

Foreign diplomats in Warsaw who had been admiring Mr Miller's apparently iron fists now fret that he is losing his grip.

ECONOMIST: Poland's government

If true, past history hints that Bernanke, increasingly a joke outside the Fed, is losing his grip on the inside on the way to him stepping down.

FORBES: Modern Fed History Points to Ben Bernanke's Resignation