A 101-year-old man told jury in Birmingham Crown court that sexual offences he committed against a schoolboy were "something that happened".
The accused also said he was "immune to feelings" after his arrest last year.
Ralph Clarke, who was born in March 1915, pleaded guilty part-way through his trial to nine sexual offences committed against a young boy in the 1970s.
He found himself in court again after the 101-year-old was accused of historical child sex offences against two young girls.
But Clarke, of Erdington, Birmingham, denies a total of 22 counts of indecent assault and indecency relating to two other complainants in the case, claiming they invented lies about his past.
The jury has begun a second day of deliberation on this case.