In (one's) prime phrase
The most successful or energetic time of one's life
In his prime, he could score 91 goals in a single calendar year.
Messi is 34 now but he is still in his prime.
At the age of 70, he still believes that he is just in his prime and keeps working hard.
someone will be successful.
A go-getter is a determined and ambitious person who works very hard to become successful without being afraid of difficulties and challenges.
One has the potential for being successful in the future ahead.
To punish someone or something harshly
He's a really strict teacher, so he'll definitely lower the boom on you if you don't do your homework.