phone contacts

 Among my phone contacts, I have:

• At least two who are deceased,;
• The estranged boyfriend of a coworker; 
• Several contacts from a volunteer service I haven't done in four or five years;
• Coworkers from previous jobs, whom I have not seen or heard from since;
• Staff who have since departed from my condo management company;
• A dentist I went to once, who I think I read has since lost his license to practice;
• A housekeeper who fired us;
• The guy who did my mother's taxes. He has since retired;
• The guy who moved my mother into her assisted-living facility, like, four years ago;
• The Philadelphia Parking Commissioner, who offered me a parking space for a day in Philadelphia three or four years ago. Is he still in office?
• Two old bosses, who, together, fired me from my previous job;
• A guy I haven't ridden bikes with in maybe ten years. He had a child, who's probably in fourth or fifth grade now;
• A contact that's simply a number I don't recognize.

I can't bring myself to delete any of them.