It seems that's never too late.
But be sure you want to.
Yes man, you are right but it is not always the right time to make investment. You need to look at the market and to identify the right time to buy bitcoin.
As this is true in the case of buying bitcoin that it is never late to buy it but if you could wait for a dip where you will buy it in a comparative cheap price than the regular. However bitcoin is now not an investment which will drown your capital but still it is good to be defensive.