He may have still been young at the time of his accession.
At the time of his accession, he was already at an advanced age.
I have nothing to say against that; but at the time of my accession to the Consulate it was very different.
Soon we shall be beyond the time of your accession to office, and you will be able to visit us only discamately.
Edward was only nine years old at the time of his accession.
At the time of his accession to throne he was an old man of 55 years.
As he was a child at the time of his father's accession, he was born sometime between 800 and 810.
By the time of his accession, he was obese and possibly addicted to laudanum.
At the time of his accession Philip the Younger was only four years old.
By the time of her accession in 1952, her role as head of multiple independent states was already established.