Steven Franklin, of Montgomery Road, was convicted at Woolwich Crown Court of 10 sexual offences, including five counts of rape.
The court heard how Kent Police launched an investigation into allegations Franklin had subjected a child to a sustained campaign of sexual abuse.
The complex investigation found there was a second victim, who had been targeted by Franklin in the 1970s.
Investigations later revealed the child had suffered at the hands of Franklin for more than a decade.
In August 2023, Franklin was charged with multiple sexual offences and ordered to appear before Woolwich Crown Court, where he pleaded not guilty to all counts.
He was found guilty following a trial.
The 71-year-old was sentenced to 26 years’ imprisonment before the same court on November 14.
He must serve at least two thirds of his sentence before he can apply for parole.
Detective Constable James McClelland said: “Franklin persistently and repeatedly assaulted his victims in the most vile manner for his own selfish gratification.
“He took advantage of two vulnerable young children, subjecting them to years abuse, with absolutely no regard for their physical, mental, emotional, or psychological well-being.
“He has subsequently demonstrated zero remorse and refused to confess his wrongdoing, instead choosing to make them suffer a lengthy legal process, during which they’ve had to relive horrific incidents.
“I would like to commend the bravery of both victims in reporting Franklin’s abhorrent behaviour and hope that his lengthy jail term offers some comfort.
“Kent Police takes all reports of this nature seriously and encourages any victims of such crimes to have confidence that we will seek to serve justice against perpetrators, no matter when the offence occurred.”
