The phrase "a considerably older" is correct and usable in written English.
It can be used when comparing the age of one person or thing to another, emphasizing a significant age difference.
Example: "She is a considerably older sister, having been born ten years before her sibling."
Alternatives: "much older" or "significantly older".
She had married a considerably older man, who had died in his seventy-second year.
Most of those children were between age 25 and 34, but I had suddenly joined their ranks at a considerably older age.
The show took its energy from the rapport between its dissimilar hosts: Mr. Bush was then a bachelor in his 20's, Ms. Elliot was a considerably older mother of three.
LA Buy this book at the Guardian bookshop The nameless narrator looks back at her adolescence in French-colonial Vietnam when, as a 15-year-old, she had a passionate affair with a considerably older Chinese man.
If you have a considerably older meter the sensor can't read the rotation and will fail.
Therefore, our patients appeared to have a considerably older age at onset of CM than those in the PREEMPT population (32.5 vs 21.5; Allergan plc, data on file).
He has also, however, been dogged by statements that suggest a considerably old-fashioned, even blinkered, view of history, having grown up in the middle of the tumultuous civil rights struggle without, apparently, having noticed much.
The couple have three other children, all considerably older than Alex.
The younger the teenager, the more likely they were to have a partner considerably older than themselves, a factor that may contribute to the potential vulnerability of these young girls.
Barbara was married to a man considerably older than herself who had a string of upstate theaters where people came to see films like Deep Throat and The Devil in Miss Jones.
Lederer, a child prodigy, who had entered college at thirteen, got to know Mankiewicz, the MacArthurs, Moss Hart, Benchley, and their friends at about the same time or shortly after he met Hecht, and was immediately accepted into a group considerably older than he was.
