It's never too late to start and you can start now to invest in bitcoin, but one thing you might need to know and you should try to study bitcoin price fluctuations, so you can start calmly and not panic when market conditions are negative. Basically investing in bitcoin is stronger for the long term, because it will provide a large return according to the capital you use and if you don't really understand market conditions, then the long term is better than the short term you can choose.
The most important thing is that you have to start according to your financial ability and you can adjust the investment pattern with a number of steps that have been suggested by many people. For example like DCA as the step you choose to maximize the number of purchases from each period your finances are stable.
We keep reading stories here that people regret not buying bitcoin when it was at 100$, 1000$ and 3000$ saying they thought it's too late to buy at that price. Right now bitcoin is at 30k$, few weeks ago it's at 16k$. So there is no way we can predict that when it will be too late to buy bitcoin.
There are lots of investment strategies that were proven correct over the period of time like some people buy at dip and sell when it's high while other prefer doing DCA. Whichever strategy you follow, make sure its long term not spread over period of time.
and this is why there's no such thing as being too late or early, or being missed out. it depends on when you got your satoshis and when you will sell it off to the market. so long you are selling it higher than your buying price, then you are on the positive profit.