By the age of two most children have begun to communicate verbally.
She was struck down by polio at the age of four.
The actor achieved fame by the age of 22.
By the age of sixteen, Frank had ditched school altogether.
Baldness affects approximately half of men worldwide by the age of 50.
For both sexes, it is usually complete by the age of eighteen.
But by the age of ten he was playing the drums for gospel bands.
For both girls and boys, it is usually complete by the age of 18.
无论男孩子还是女孩子，通常都是到 18 岁成（青春期）。
So much so he taught himself French and English all by the age of 6.
Each Indian of the Great Plains could ride a horse by the age of five.
This give-and- take allows them to use fluent sentences by the age of four.
One patient, who began puberty blockers aged 12, suffered four fractures by the age of 16.
By the age of twelve, he had created his own video game, Blaster, which he sold for $500.
By the age of four Beverly was singing on a weekly children's radio program and also making radio advertisements.
But the latest data also showed that 5.3 million children worldwide died in 2018 by the age of five.
She could read by herself at the age of four.
By the age of seven she had invented over 60 different signs by which she could talk to her family.
By the age of two, I was reading books.
在 两岁，我(开始)读 书。
Do you know he was a multimillionaire by the age of 35?
By the age of seventeen Arnold had already realized that bodybuilding was going to be his vehicle to worldwide fame.
By the age of 18 he had won 108 bouts, six Kentucky Golden Gloves championships and two national AAU titles.
" All of our partners are multimillionaires by the age of forty-five, " Royce McKnight said.