Start with high-confidence aging gracefully books, then narrow by subgenre or adjacent topics.
Goddesses in Older Women
Jean Shinoda Bolen, M.D.
Aging Backwards: Updated and Revised Edition
Miranda Esmonde-White
Game Plan
Bob P. Buford
Younger for Life
Dr. Anthony Youn M.D., Anthony Youn
The Aging Brain
Timothy R. Jennings MD, Timothy R. Jennings
Stupid Things I Won't Do When I Get Old
Steven Petrow
Medicare for Dummies
Patricia Barry
The Ultimate Retirement Guide for 50+
Suze Orman
Lifespan
David Sinclair, Matthew D. LaPlante
Joyspan
Dr. Kerry Burnight Ph.D, Kerry Burnight
The Book of Old Ladies
Ruth O. Saxton
Essential Retirement Planning for Solo Agers: a Retirement and Aging Roadmap for Single and Childless Adults
Sara Geber, Harry "Rick" Moody,
The Well-lived Life
Gladys McGarey, Mark Hyman
How to Retire
Christine Benz
Mayo Clinic on Healthy Aging
Nathan K. LeBrasseur Ph.D., Christina Chen M.D.