To redirect your younger cat's energy from the older one, you need lots of options for where to redirect it. You mentioned in a comment that you do have a wand toy for him; get more. Offer him a variety (and if he's inclined to damaging them when left unattended, find a place to hide them that's inaccessible--I personally use heavy dresser drawers my cat can't pull open). There's lots of options of wand toys on the market--feathery ones, ribbon ones, springy ones, ones with prey toys on the end, and so on.
If he likes those, look into similar toys, as well; there are bases and scratching posts with toys on "springs," cat towers that have dangly toy attachments (and also have the benefit of giving him something to race up and down, or a possible refuge for the other cat), toys that hang from doorknobs, and toys on elastic that hang from door frames.
Try a laser pointer with him. In spite of reports that they're "cruel," every cat I've ever interacted with genuinely enjoys the chase and isn't bothered by not being able to "catch" the toy. It's one of the fastest ways to burn off excess feline energy, and can be entertaining for you as well, especially if you have a hardwood or tile floor.
Try out different kinds of balls. My cats have a selection of hard, plush, crinkle, jingle, "lumpy" (with an unpredictable movement pattern), and pompon balls to play with. On softer ones, you can marinate them in catnip to make them extra appealing and burn off more energy. You can also get track-bound balls, which are balls locked into a larger piece, and which cats enjoy batting around as they try to knock it loose.
Offer different sizes of "prey" toys. Not just the classic little mouse, but the bigger "kicker" styles, in-between sizes, and different shapes. Try different amounts of catnip, different textures, and toys with or without "crinklers" inside.
Periodically, move the couch and throw all the toys that have disappeared under it back into the room to be "fresh" stimulation. Often, they will have been lost so long that they'll feel new to your cat.
Essentially, you'll want to do your best to overstimulate your younger cat. Give him so many choices that there's always some way to redirect him when the older cat wants to be left alone. With safer toys, you can even leave them out while you're at work and let him burn energy while you're away--though you should always make sure all parts are securely attached and there's no damage before letting a toy be an unsupervised toy.