40 aint to old, hell i BS'd with a guy that had an 89 CRX SI with a zc swap full suspension intake, header,exhaust, KAAZ, gutted pizza delivery/autocross car and he was 68. my buddy (99 JR charged SI) and his older brother (95 EX coupe w/fully sleeved/built turbo'd B18C) convinced their
MOM to buy a 00 sedan and its running a tanabe exhaust, intake, eibach's, AGX's, JDM headlights and a license plate that reads "MUMZ CVC".
so the awnser is no 40 isnt to old to be working on and loving honda's.
word of advice though, choose your suspension carefully, cause it is the old ladys car and if what you pic is too stiff you'll never hear the end of it