There is a famous “100 minus your age” rule.
It says…
Spend the percentage equal to your age and Save/Invest the 100 minus your age percentage of your total income. Let’s say your age is 24. Then, spend 24% of your income in your expenses and save/invest (100–24)=76% of your total income.
As you age older, your needs will increase. For example- your family expenses, paying your kid’s tuition, home loans etc. Then you might not be able to save/invest as much as you can in your young age. In short, this principle states to gradually reduce your savings as you get older and invest/save more when you are young.
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