i think it is, because in the year 2011 you can buy a Bitcoin for only 4$ and if you buy 100 Bitcoin before and you still have it now , then you are a millionaire , and if you buy bitcoin now it's late, because the price of BTC now is expensive
For our world today that bitcoin is growing so fast and spreading like a storm i think that its never been to late to invest in bitcoin. You can choose bitcoin as your full time or part time business in digital currency.