Tony Cetera is 79 years of age and has bad legs, but that doesn't stop him helping the homeless whenever he can.

His philosophy and process are simple and unstructured, but if everyone followed his example, there's no denying it would make a difference.

"Just try to do good," he says. "Even if you just give one can of oil sardines to the guy on the train who hasn't bathed for a week, your mission for the day is done."