I'm 78 and still working part-time. Here's how I've stayed involved with what I love, 16 years after retirement.

I'm 78 and still working part-time. Here's how I've stayed involved with what I love, 16 years after retirement.

Nilo Jimenez for BIThis as-told-to essay is based on a conversation with Donald Kimmel, 78, who retired from his role as a bone biologist 16 years ago but continues consulting and peer reviewing articles. Kimmel, who lives in The Villages, Florida, said he's stayed healthy and active and has enjoyed his retirement years, even though he doesn't often get to the beach. His words have been edited for length and clarity.Socially and career-wise, I h…