I also thought my facial hair was shit until I let it grow and it was pretty okay, and people told me I look 30 whereas before I looked around 20. Never went back to clean shaven ever. My moustache and beard are patchy as fuck but still better than looking like a fucking toddler

We've been placing our finger over our top lip as a mustache for generations, I'd start by doing that regularly. Will add 5 years ezpz

Just enjoy it while it lasts. People have consistently estimated me 10 years younger than my real age for decades. Well, until now, since I'm getting some grey hairs.

Have kids. The people with kids who are ten years younger than me look twenty years older than me.

start smoking and drinking, cut back on sleep and find an unfulfilling stressful and thankless job that also underpays. throw in some women/partner/spouse that treat you like shit to really speed this up.

A good haircut can help. Get one that fits your face better than whatever standard cut you've had since middleschool or earlier.

Fat hides change. Get fit.

A lot of the difference between hs and mid 20s is largely about demeanor. How you carry yourself with a bit more knowledge about who you are.

Just wait…

Hang on to that shit as long as you can.

You can do it with a toothbrush. Just brush your teeth twice a day and you'll look older sooner than you expect. It's actually pretty annoying. You get all kinds of infirmities to help you act the part. Enjoy your youthful good looks while they last.

Hi!!

Not sure of your complexion, but a tan could make you look a bit older.

A hair cut that fits your face shape is another thing that could age you up as well.

Other than that, I say the clothes you wear, but that can be hit or miss.

Stress.

One of these?

We wait ten to twelve years.

Lifting weights? Dressing more business casual, perhaps. That’s a tough one.

Clothing is a good bet. Someone who's more up to date on fashion trends may have better advice but button-ups are usually like $5-10 at thrift shops. Any color of plaid with the sleeves rolled up and the top 2 buttons undone is casual enough for most situations.

And if you can grow a beard but it's slightly patchy, see a barber or cosmetologist that does brow and hair fill-ins with henna. It'll be a little pricey the first time but ask and pay attention to how they apply it based on your needs then just buy the henna yourself. It's temporary, won't hurt your skin, and will get you through the next few years until you can grow a fuller one. It also helps to have it uniformly trimmed and 'edged up.' You'd think cutting it would make it look patchier but the trimming will prevent long wispy hairs accentuating the shortness of the patches and having it edged up will give better contrast against your skin.