The exact time when a current computer becomes obsolete depends on technological change and innovations. Usually computers will have a lifespan of 10 plus years where software still supports the older operating systems.
A computer might be old when it stops working anymore and when it starts slowing down.
As soon as you buy it.
That means that it is no longer able to perform with current technology. For example, you could not load Windows 7 on a 286 computer; that computer is obsolete.
Keyboards may even become obsolete as voice activation equipment becomes more sophisticated.
An example of an obsolete computer part is the Floppy Drive/ Floppy Disk.
Current
Warriors are not, nor likely to be, obsolete.
Usually for a small time after they become obsolete.
well, obsolete means out of date, so the best i can think of is up to date or current.
8 track started to become obsolete in the early 1980's in the USA.
Sundial
Yes, some can become obsolete if they are based on politics or wars that are not longer current- as with some WW-2 propaganda songs rarely heard today.
remote control
It becomes obsolete.