When you’re in your 20s, you have your entire life ahead of you. The world is your oyster, and your lack of experience and wisdom may make you feel naively invincible.

However, Father Time waits for no one. Before you know it, you’ll be in your 40s, remembering what you’ve taken for granted. You’ll also likely be one of those answering this Reddit question: “What’s something people in their 20s don’t realize will affect them when they get older?”

Commenters shared the mistakes they feel young people could avoid committing, from ignoring bad posture to poor financial planning and settling for second best.

If you’re part of the younger crowd, feel free to take some notes. But if you’re at least 30, hopefully, this list doesn’t make you feel too old or regretful.

Know when to walk away. F

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