never is never too late
If you don't have much money to invest it then join and build it. You are still young. Crypto industry needs young people.
I agree that there is no term of late investing in Bitcoin.
Sure, we can invest in Bitcoin whatever the money we have. We don't need to invest in 1 BTC if we have no enough money. We can invest $50-$100 for Bitcoin. I also never buy 1 BTC, I buy smaller amount of Bitcoin. However, it gradually becomes bigger and bigger, then we may have 1 BTC for our investment in the future.
Not only young people can invest in Bitcoin. Old people also can invest, there is no limitation for ages. As long as a person can understand the Bitcoin investment, it is okay to join Bitcoin investment. Well, probably Senior high school students are the minimum ages for investment. Senior high school students can understand the investment.