Anti Aging / Staying Healthy

All the following with the caveat it depends on your current age, family history (genetics),etc. And obviously ask a doctor and DO YOUR OWN RESEARCH - don't blindly follow advice from a 26 year old anon on WSO. 

Although imperfect, as a baseline, recommend you:

1. Get a DNA methylation test (i.e. biological age test)
2. Get a basic DNA test (23andMe works), and upload the raw DNA data (literally in .xls) to Promethease, a tool that builds personalized DNA reports based on linking DNA genotypes to scientific findings cited in SNPedia, for like $10. Google how to do this. This will help you to identify your genetic risk factors for Alzheimer's, heart disease/attacks, various forms of cancer, etc.
3. Look at your family - what diseases do they have? What did your grandparents/parents die from? Low hanging fruit 
4. Get a basic familiarly with what aging actually is (google "the hallmarks of aging") - first principles stuff 

With that out of the way...

Level I Proficiency Anti Aging - Bronze Tier (packs 90%+ of the punch though)

• Consistent aerobic exercise & anaerobic exercise (i.e. cardio and lifting); find 30 minutes a day - you have time for it, eat lunch at your desk if necessary
• Eat relatively clean - I personally enjoy a Mediterranean diet. Sweetgreen is great. Find healthy foods you actually like or you wont stick to it
• Eliminate or minimize heavy drinking / substance use (I still indulge in good drunken revelry from time to time. Life involves trade-offs) 
• 6+ hours of sleep; when possible, obviously, but make it a priority 
• Meditation / mindfulness 
• Have a sense of direction / purpose for your life (doesn't need to be grandiose) and high-quality relationships - critically important and sometimes overlooked

(in addition to all the above)

Level II Proficiency - Silver Tier 

• Extended periods of fasting / caloric restriction; one of the only tried & true methods of extending lifespan/healthspan across literally every species it has been tested on; I personally fast 24 hours every week, 72 hours every quarter, and 120 hours every year; make sure to it can be a spiritual experience / change your perspective on food. 
• Basic, well-researched supplements, tailored to you (multivitamin (debatable if needed, but get one without iron unless you are a pre-menopause woman - iron may age you further), fish oil, creatine, vitamin D if lack of sunlight (likely applies to everyone on this forum), daily aspirin if at risk of heart attack (be careful here - risk of internal bleeding), turmeric if you have the gene for Alzheimer’s). Make sure to get from reputable sources (see LabDoor.com), as fish oil can be rancid and supplements are oft contaminated
• Avoid red & processed meat and animal protein in general (I don't do this - i like meat too much, but avoid processed garbage and err on the side of consuming eggs/white meat/fish) - however supplement with high potency B-vitamins if you cut out meat (vegans/vegetarians typically deficient); generally speaking, the Methionine in meat will age you; protein intake / healthy muscle mass is also critical for longevity, so this can be a double-edged sword.  

Level III Proficiency - Gold Tier  

• Advanced supplements (caveat - some are speculative and some have decent evidence; none of this matters if you aren't already Level II Proficient; also depends on your age (silly to take all of these if you are 20); the Interventions Testing Program (ITP) is considered the gold standard on testing these, at least in animals, so maybe start there); examples include, in no particular order, Glycine, Spermidine (lol yes that's the name), Berberine (if prone to diabetes / high blood sugar), Quercetin/Fisetin, NAC+Alpha Lipoic Acid, NMN (im personally skeptical of NMN however)
• Certain off-label prescriptions (proceed with extreme caution): Metformin (similar to berberine), ACE inhibitors, Angiotensin Receptor Blockers, PDE inhibitors, Lithium, Acarbose

 Level IV Proficiency - GOD Tier

• The Undisptued, Unrivaled Champion of the World.... RAPAMYCIN (low dose, taken intermittently) - would not start this until at least 30+ years old. Outside of caloric restriction, this is the only intervention that provably extends lifespan across all species (of which there are many - from worms to mammals) it has been tested on
• The evidence that rapamycin can function as an anti-aging drug is the product of thousands of scientists working independently all over the world, studying mTOR and its inhibitors for a variety of different reasons 
• I won't go into the details but suggest you read this if interested: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6814615/#:~:text=The%20ove…;

Best of luck and I will end with a Clint Eastwood quote:

“I get up every day and don't let the old man in.”