You're fine until 40. Then you have to earn your existence. You'll slowly begin lifting, stretching, vegetarian eating, cutting out other foods like sugar and saturated fat, getting the proper supplements such as D, B12. Also bringing in lots of fiber, mixing sitting and standing, various forms of stress relief like breathing, meditation, etc.

Smart things to get started on now include: skin care, at least SPF and moisturizing, posture - watch out for gluteal amnesia and "cell phone neck," hand/wrist/finger stretching and strain care, eating low-sugar, learning to cook, finding sports/physical activity you can enjoy long-term, taking care of your eyes, follow the 20/20/20 rule, scalp massage to reduce baldness if applicable. Also paperwork: start an organized system that's mirrored and on offline, and get a basic will set up.