This fund we can manage through monthly savings where a certain amount of income will be saved regularly. It may be 10% of income or more. If a person's income is $1000 then 10% of $1000 is $100, so in 30 years his savings will be $100×12×30=$36,000. Assuming 2x the profit in 30 years we get a return of at least $72,000 which I think would be enough for a retired person to live on.
Stocks return pre inflation are 7%, this roughly means doubling every 10 year.
Basic math with interest rates puts this at over $110,000a bit more since I rounded it annually.
Also for a guy who before retiring, so this means entry-level, he has a wage of $1000, at 2% inflation, this means around $1700, so your savings would be worth around 4 years of entry-level paychecks, hardly anywhere in the ballpark of living comfortably as a retiree.
Putting it in perspective, you've started working at 20 for $1000 a month and you saved enough for $200 a month for your old age 30 years later!
Unless you're aiming for something x200 your wage in savings at the start of your retirement you will never get close to a life without worries.
For me, Bitcoin double it's price every 4 years, so if you invest for 30 years, it should be 27 which is 128x, $36K x 128 = $4.6 Million.
Never gets old:
