No it's not too late to invest in bitcoin, but it was better of course to invest before, anyway if u want tou invets you can invest also now , because bitcoin is the best in this market , so you can invest also now! But if yiu had invest before you would have great chance...
Agreed, for me it is the right time to invest because Bitcoin is not yet at peak which I believe by this coming year end it will gonna bounce back to peak. But if you are in doubt, invest only an amount which you can afford to lose but then I guarantee Bitcoin is not bubble.