I know not how to aid you, save in the assurance of one of mature age, and much severe experience, that you can not fail, if you resolutely determine, that you will not.
The traits the word 'childish' addresses are seen so often in adults that we should abolish this age-discriminatory word when it comes to criticizing behavior associated with irresponsibility and irrational thinking.
In this day of wonders no one will say that a thing or an idea is worthless because it is new. To say it is impossible because it is difficult is again not in consonance with the spirit of the age. Things undreamt of are daily being seen, the impossible is ever becoming possible.
Our relationship with alcohol is a hologram for how human beings relate to the natural world. When you get to that level of brown liquor - an age distillate of a fermented thing, grain that we learned how to plant and make grow - it is in some ways the best expression of what humans are able to do. Nobody else can make that! And it's delicious.
Old age, believe me, is a good and pleasant thing. It is true you are gently shouldered off the stage, but then you are given such a comfortable front stall as spectator.
If I had been helping the Almighty when he created man, I would have had him begin at the other end, and start human beings with old age. How much better to start old and have all the bitterness and blindness of age in the beginning!