Not too late. Although the price might seem high today, imagine you bought in at $7.5k and it goes up to $25k, you'd definitely be glad you invested!
Yes, it's not yet too late. Actually, if ever bitcoin is still after twenty years, I believe that people in that age will surely invest in bitcoin. Though in that case, we may think that it is already late, but I think there's no such t hi in as late if you really like to have it. There's no need to think about investing late because you can still have the chance as long as you are still alive and kicking. When opportunity knocks, don't hesitate to open and accept it rather than refusing it.
Yes it's not, because it's in down trend phase now, and this could be a good point to get some bitcoins. You can't find the exact good enter point, but you can make this current price as your cost of purchase now.