I've been asked this sort of question many times, and in different ways. I decided to compile my best answers into the 21 things you should know by age 21, and offer some advice for young people.
If you are looking for advice for your 20s, or whether you are in your 80s, here is my opinion on what matters most in life. Some of the items might surprise you, as they are not often spoken about.
My advice to young people — if you want advice from old people — is to live your best life today. Tomorrow you might be my age. Will you have something to smile about or regret?
What really matters in life is subjective, but I wish I had this 'advice for youth' when I was 21 years of age. This is really the same advice for young men as the advice for young women. We are all human.