I have been looking to try to get into Vicky 2 for quite some time. Will definitely look at these videos, thanks for posting!
I think age is actually a plus when it comes to learning these games (as long as you have a little experience with strategy games).
Myvery humble opinion is: start with EU4, I think it's the simplest of them all. Watch some videos on the tube (I personally liked Quill18 first playthrough) and start with an easy country. Easy doesn't mean powerful. My suggestion is Portugal.
EU4 is definitely less obscure. In your case, check your succession laws, maybe you're under pure cognatic in which women can't inheritI sunk almost 200 hours into CKII and I still can't figure out what on earth is going on sometimes, every time I think I've grown enough to tackle an ironman game (no saving, you have to deal with all your consequences) I crash and burn horribly because the game does things I just didn't anticipate.
Right now I have a situation where I started as duke of Saxony. I manufactured and pressed a claim for the Bishopric of Hamburg, the bishop disagreed to step down and so I took his temple in a siege and imprisoned him. Now I'm a feudal duke and squat in his bishopric by virtue of holding the capital temple of Hamburg county - which is considered the wrong holding type for a feudal lord like myself so I want to get rid of it eventually without losing control over the county. Fine then so I sneakily kill a baron in Hamburg county and his castle holding is inherited by me. Now I hold the temple and one castle in the county of Hamburg and the temple is no longer considered the capital - the castle and the temple switched places and the castle is considered the new capital. Suddenly I get a message about "Title loss on succession" meaning upon my character's death the castle and the temple of Hamburg county will not be inherited by my successor - which happens to be a girl because I hit a Henry VIII streak. What is going on here, why won't she be able to inherit Hamburg if it is no longer a bishopric, seeing how the castle is now considered the capital? Only the devil knows, CKII will confront you with situation after situation like this that are exceptions to the already complex rules you thought you understood.
I feel EUIV is in many ways less obscure and a much easier as a start to get a foot into the door of paradox titles. Also it has much better interface design, but in its own ways it can be as deep as CKII yet less confusing. You're only to old to learn new things if you think you're too old, but I would still suggest starting with EUIV to ease into this genre.