AT TWENTY'S AVOID ALL THESE

Sadly, we will all get older. And with age comes an expected level of maturity. It’s at about 22, when you’ve just left university full of misguided self-importance and purpose, that this all begins. Your teens -- and those wonderful, hazy years you had as a student -- are now over and things that were once amusing or deemed inexplicably ’normal’ now cease to be socially acceptable.

In fact, as you enter your ‘adult adolescence’, it’s probably best to avoid these things altogether. For society will give you a pass on quite a lot during your 20s but these things, well, they’re just not cool anymore.

Downing Things, Voluntarily

Sinking an entire pint sub 4-seconds was once considered by you -- and all of your mates -- as an ‘alpha male’ quality. A talent many sought to nurture but few truly mastered. You, on the other hand, practically had a degree in it. Alas, your peers no longer view this as an admirable trait. In fact, it’s slightly awkward. Not only is it getting a bit pricey – it’s just that forcing your housemate to down a bottle of wine is kind of unhealthy. So lock away your inner-drinking fury and resist the urge to organise all the fun. Aside from stag dos. 

Sleeping In Until 1pm On A Saturday

Productivity. It’s at an all-time low when you’re lying-in. As you negotiate your 20s, people expect you to make the most of your day. You'll have places to be, friends to see, things to sort. That annoying housemate doing his washing at 9.30am on a Saturday before nipping in to the bank to sort his ISA? That should be you, trooper. During the week, everyone tends to be horribly busy so weekends are precious. Here’s the unwritten rule: Saturdays are doing days, Sundays are rest days. So, seriously, why waste all that doing time?
 

Ignoring The Gym

You've always wanted to get fit. It's been on your to-do list for some time now. But there comes a point in every man's life where taking pride in one's appearance becomes a priority (among a long list of other new, mildly-annoying priorities that require a bit more hard work). That point is right about now. Whether you want to build muscle or shift some extra weight, we promise: that little ego boost you'll get every time someone notices how superb you're now looking? Worth it.

Relying On Your Parents

One of the major problems you will undoubtedly have already faced is the fact that you have no money. Your 20s may timeline that awkward financial phase where you’ve left home and have your independence but don’t have much/anything in the bank for all your fun-filled adventures. Quite the predicament. In solving this completely unavoidable problem, there are two types of man.

The first controls his finances, living within his means, and plans as best he can to save or make his money go further. The second runs out of cash and calls mum and dad for a bail out. Unfortunately, option two won't do much for the old self-esteem. Or aid your parents' view of you. Time to start taking those bank statements seriously.

Wearing Sneakers With Everything

The days of slipping on your favourite pair of trusty Converse, in preparation for any situation life may throw at you, have come to an end. Your 20s are the time of your life where you develop style -- and acknowledge that your boss would probably appreciate it if you wore some smart shoes to work now and again. Just as with cooking like an adult, dressing like a man shouldn't take any more effort.

Leaving Your Work Until The Night Before

We’ve all been there, at 3am, gulping down a can of energy drink and struggling to finish that essay due in the next day. But now is no time to be submitting your second-best. From now on, life is hard. Your 20s are like starting all over again -- suddenly you’re at bottom of the pecking order once more. You’re up against hardened professionals, who’ve done it all before, and will have to fight to kick start and maintain your career. Time to drop those bad habits and be proactive with your work.

Research also from https//uk.askmen.com