On web video conferencing

So as part of having downloaded a huge number of public domain books for free or nearly free to my Kindle, I actually read or re-read Tom Sawyer by Mark Twain, and enjoyed it quite a bit. Perhaps it's because I also grew up close to the Mississippi River, though not in Hannibal. Though it's no guide to web video conferencing, it's still fun to read. One thing that confused me was the age of Tom Sawyer. It's never given. Early on in the book he seems very young. Perhaps it's because of the concern over marbles and other useless geegaws. By the end of the novel he seems quite a bit older. He's seen his own funeral and saved himself and Becky Thatcher from being lost in the old cave, and with Huck Finn found a treasure in gold. I sure didn't remember that.