No. It is not too late because there are many people who uses bitcoin who wanted also to invest but they have a question in their mind if it's too late. It's not yet too late because as long as bitcoin never stops, investment will never stop also. As long as there are users, there is bitcoin and if there's bitcoin, there will be an investment.
Actually, it is never too late to invest in bitcoin but I think the best time to invest in bitcoin was several years ago where the price of bitcoin is cheap and very affordable. You must invest now because the price is on downtrend and it is your chance to have and buy a lot of bitcoin. Its never too late to invest and just try to invest now and become rich in the near future.