Hello guys,do you want to learn html online for free,so here i will tell you from where you can learn html for free.according to my experience,i recommend you juneja technolgy.They teaches you html/web designing.first of all,i want to tell you that html and web designing means same.web designing is done by html.so,you can start learning with juneja technology if you really want to learn html.i personally really like juneja technology because they teaches us free of cost and really in friendly way.they have great knowledge of web and app development.This is logo of juneja technology:

So,go to youtube,search for juneja tecchnolgy,subscribe and start learning.currently,(july,2019) they are teaching html.but in future they teach full web development.so you can check on youtube what is currently going on.your age doesn't matter if you have an interest in website making just start learning with juneja technology.they teaches you each and every thing in very easy way.