At what age did you retire?

I was basically kicked out of the computer industry after 30 years in media duplication and data eradication. At 55 and unemployed I found that age discrimination is alive and well in the tech industry. Spent two years trying to get back in at any level but it didn't happen. Now at 57 im working as a custodian at a high school. The school year ain't bad but the summer time is hell. Lots of very physical work and it's hard to do with some of my health issues. Never thought I'd be this age and doing such a physical job.
I'm hoping to retire at 63 if my body lasts that long.