He told the conference that Scottish Labour leader Johann Lamont's questioning of the affordability of universal benefits was "Tory philosophy".
Mr Neil said: "To Johann Lamont I say this: Do you not realise elderly people have worked in some cases for 50 years and paid through their National Insurance, income tax and other taxes?
"They have worked for it, they have paid for it and they deserve it – and we will make sure they continue to receive free personal care."
He added: "As long as the SNP is in charge of the NHS in Scotland there will be free prescriptions for everyone in Scotland."
Meanwhile, Malcolm Balfour, Glasgow councillor for Drumchapel and Anniesland, led calls to reject UK moves to reduce the statutory notice period from 90 days.
He said: "This is another assault on workers' rights and will only lead to more conflict in the workplace."