Have to admit I cringe when "declawing" is brought into the equation.
I suggest a squirt bottle, keeping an eye on kitten and giving him a spritz when he gets too rough. Also, distracting him with toys, feather on a string, laser pointer ball trapped in a raceway...something to bleed off his excess energy. You have to help your older kitty cope.
Our Calamity Jane Grey was a little over 17 1/2 when we introduced Silver Kestrel to her as a 2 month old kitten. She was 19 when we introduced Hildiekatt and a little under 20 when we brought Chesapeake Bandylegs into the family.
By keeping careful watch, which was helped by my wife being home most of the time, we had a good outcome.
This is a link to the 4 of them keeping a pile of my clean laundry warm. Cammie is closest to the camera. The muted tortie with the lovely green eyes is Kessie. Hildie is the cocoa tortie and Chessie is the little grey.
http://www.medhelp.org/user_photos/show/468122?personal_page_id=861638