Re: anti-aging supplements
Eat healthy foods. Exercise. Do not smoke or use recreational drugs (legal or illegal), and avoid secondhand smoke and other environmental toxins. Avoid getting sunburned (although getting a little sunlight can help you get vitamin D). Visit your doctor, dentist, and optometrist at the usual intervals for checkups (and dental cleanings) so that problems can be handled early instead of being allowed to get serious enough to do permanent damage.
You cannot prevent getting older. But you can increase your chance of being healthy and active when you are old, rather than being painfully in bed with nothing to do but take dozens of prescription drugs.