Do every test available for prevention and prophylaxis.
Get your general practitioner to do a full health check, ECG, EEG, cardiac ultrasound, a full blood panel, bloodpressure, pulmonary function, skin cancer prevention ect.
Schedule a gastroscopy and colonoscopy.
Check in with an urologist to get your prostate and urinary tract checked.
If you can, get a full body scan. Either PET or MRI.

Nearly every serious disease or health issue is easier prevented or treated when caught before it casues real issues.
Every cancer there is, has a better outcome and is easier treated when found early. Most of them are silent until very late in the game.

This is something I would recommend to anyone: Take advantage of every preventative messure or examination that is available to you!
There is no illness that you can detect too early.