Thank you!

50, and still programming on the same codebase I started when I was 18.

Apparently Steve Newman worked on it too. Is this the same Steve Newman that famously founded Writely (became Google Docs) and almost won at Topcoder one year?

Yes, as well as FullWrite and many other products.

When the hardware failure is more frequent than failures in your software, we can consider that "good enough" (for consumer-level applications.)

I started programming on an HP-65 in the 70's. That was before graphing calculators, though.