It depends on the age difference, how frequently I left my kid with them, and how much they'd been in touch since the days they were actually young enough to need sitting. Because I'd be concerned, you know, did the babysitter groom them? When did the babysitter start sexualizing them? If the babysitter was an adult, or much older than my kid, while they were babysitting them back in the day then I would be deeply uncomfortable and worried.