Just curious, if you constantly work till say 55, saving diligently and investing occasionally. Can 1 survive? Feeling tired at work and thinking of retiring already...

Yes is possible if one keep spending lifestyle in check, and maintain a healthy lifestyle, after all, medical bills eat up a huge portion of retirement fund. Keeping oneself healthy and active is a huge help to sustain retirement fund. Not just physical health, but mental health too.

Retire too early, brains may deteoriate due to lack of brain stimulation

Depend on your salary and also your lifestyle when you retire.

Definitely possible.

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But you need to be at least and average earner, and have to plan early, invest, save and be prudent.

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I am turning 49 soon. Started working at 28, by 55, I will be able to retire and my plan ends at 98. Lifestyle costs important. I am not a big spender and not an very high income earner.

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I use property, investment, CPF and SRS to plan the different stages of my retirement. At 55, OA will start unlocking money. At 62, SRS will unlock amount tranche, 65 will be the final tranche. Investment income and rental income will be as soon as you complete it. You have not disclosed your age, if you are in your early 30s, you can definitely do it. I started planning only at 36 after two retrenchments.