He solved a large number of problems.

His handwriting is very beautiful.

He is weak, so he is not good at sports.

He is weak for his age.

He is good at making a living, always overcoming difficulties.

His only weakness is his resistance to sweets.

He has a weak body and gets sick easily.

He finished the job in slightly less than an hour.

By looking at the age of the teeth, you can tell the lifespan of an elephant.

Considering his age, his vitality is astonishing.