According to this math in 230 years Bitcoin will be worth 1 trillion $. Given that Bitcoin will keep following this logarithmic function make sure you put aside 0.01 BTC in paper wallets and save it somewhere.

1trillion

This is what heltok from reddit said:

If we assume that bitcoin’s value will be the same, no growth in the US economy and US money supply keeps expanding at present rate, then 1BTC will be worth $1T in 230years.

The source that he used to calculate the money supply ishttp://www.shadowstats.com/charts/monetary-base-money-supply

 I think it would be a good idea regardless to put away $5 of BTC into a paper wallet and write on it to not use in until 10 years have passed.