there is nothing too late engaging on btc investment as long as you have the guts to take risk of either havinf profit of thousand bucks or losing. Well btc price now might be too huge compare when its just starting but who knows it may multiply hundred folds more.
It is never too late when it comes to bitcoin. As long as you are wise and lucky enough, you will succeed for sure no matter when you start. Some may started years back but still struggling and some may started only months back but already succeeding. Bitcoin is not a game that whoever started first will win. It will always be your perseverance, intelligence and luck.