The phrase "a reasonably young" is correct and usable in written English.
It can be used to describe someone or something that is relatively young compared to others in a specific context.
Example: "She is a reasonably young candidate for the position, bringing fresh ideas and perspectives to the team."
Alternatives: "fairly young" or "somewhat young".
Provided a woman is reasonably young and healthy, and has not already had many failed IVF attempts, in each IVF cycle only the embryo that develops best is returned to her womb.
We have shown in a representative sample of reasonably young men that treatment for early prostate cancer has important and persistent adverse effects on quality of life.
Roosevelt wanted the replacement to be a "thumping, evangelical New Dealer" who was reasonably young, confirmable by the Senate, and from a region of the country unrepresented on the Court.
Two years later, he shortened the army enlistment term from 12 years' active service (it had been 21 years from 1815 to 1847) to six years' active duty and six years' reserve obligation, making possible for the first time in Great Britain a large, well-prepared reserve of reasonably young men.
Just a reasonably pleasant (young-sounding, perhaps too young for her age) woman's voice singing on pitch.
The Oilers traded Taylor Hall, a superstar winger, to the Devils for Adam Larsson, a reasonably good young defenseman.
He also was 26 years old at the time, a reasonably thoughtful young man from a single-parent family in a poor precinct of Akron.
If you're reasonably young and reasonably healthy, consider purchasing a moderate amount of term insurance, which is the cheapest form of life insurance.
The couple, married for 32 years, see the medical foundation as an adventure, a way of giving back to society, while they are still reasonably young and energetic.
