any time you can become a trader. but my suggestion, when you start the better the earlier you already have a basic trade and try with a small capital. so you will not lose much in the beginning, and small capital is very good for learning.
Yes any time can be the right time to become a trader and don't forget that you need to have enough pocket money in able to start buying good alt coins. Don't be like those other newbie traders that wants to earn big amount because that is going to pull them into losing. It's always a good thing that you can start with small amounts.