Former teacher Geoffrey Oborn, 79, repeatedly abused two girls and a boy in Kent.
He denied 13 charges of indecent assault and one of gross indecency but was convicted by a jury.
Sentencing him at Maidstone Crown Court, Judge Philip Statman said Oborn led a double life and seized on the vulnerability of his victims:
"You must have thought, as the years passed by, that you had got away with it."
Mr Oborn was sentenced to 7 and a half year imprisonment and was also banned from working with children or vulnerable adults and put on the sex offenders register. Paul Valder prosecuted the trial and sentence at Maidstone Crown Court.
Paul Valder is an experienced barrister who prosecutes and defends crime at all levels. He is a CPS level 4 appointed advocate and appears in cases that demand his level of experience and expertise. Paul has particular experience in MTIC cases, complex frauds and white-collar crime work. As a consequence he is regularly instructed in complex confiscation post-conviction.