Some components too old now?

Too old? (from 1990???) old, them components are just babes...!!!Look at folks still using equipment built in the 1950's 1960's...I use Cd changers built in the mid 1990's and consider them to be great. I just bought a preamp built in 1987. Coveted product... works great.          
I also say do not worry about them. If you want 'peace of mind'.. Buy some spares. (unless the items you have a 'classics' cheaper to just replace than repair)

The advancements in technology have been on the digital side.  If you are happy with your analog rig I would leave it alone.  Your CDP can still be a fine transport.
Amplication has changed but not necessarily for the better.  I would get a new DAC and stop there for now.

Too old? (from 1990???) old, them components are just babes...!!!Look at folks still using equipment built in the 1950's 1960's...

And for the most part I agree with @Elizabeth, but I know for sure that DACs got soooo much better over the past few years it is completely worth auditioning them.

I agree that the analog equipment may be fine but you might want to consider a new DAC. 

Although I hope to move up a few steps in the next year I've been very happy with the Project Pre Box S2 DAC at $400. 

If not sure about the CD player might consider the Cambridge Audio CXC, $450. 

I'd be Excited for your Old!  Depends on what your trying to accomplish with "Any NEW??"   I just Fired up all my Old.. too much to list, yet the Old Power Supplies are the BEST! -- I have a 1992 DAC from Howard Mandel who since passed - seperate power supply and compared to New DAC's and you have to spend 5K Plus to out preform that - his CD Transport too, Thiel Speakers, Maganapan's, old Kenwood reciever in wood case and so on..  MOST Important Clean, Blow Dust D irt out from Air vents on side, better yet take the top/side off and Blow out Good.
Clean all your RCA's and if they are the el cheapo's get good ones you will notice a difference.. Good Luck..