Morton Hughes, 76, was found to have committed the offences between 1975 and 1981 at a finding of facts hearing at Shrewsbury Crown Court.
The offences included indecent assaults on a boy and a girl, gross indecency on a boy and inciting a girl to commit an act of gross indecency.
Detective Sergeant Andy Dawson, who led on the investigation praised the victims in the case for coming forward.
He hopes that verdicts give confidences to other victims of historic sexual offences.
He said: "The investigation and subsequent finding at court has shown how seriously West Mercia Police and the Crown Prosecution Service take allegations of sexual offences, regardless of when they happened.
"These offences happened around 40 years ago and I would like to thank the victims in this case for their bravery and courage in coming forward after this time to report the offences to police.
"I hope the verdicts show that victims of sexual offences can come forward to police and have confidences we will listen to them and take appropriate action.
"I also hope that this will demonstrate to others that offenders will be brought to justice and be accountable for their actions regardless of their circumstances." The hearing concluded on October 18. Hughes, formerly of Meese Close, Wellington, will be sentenced at a later date.