2008... I am pretty sure it is Cat 5e, not Cat 5.
For the existing in-wall cabling Cat 5e, in most cases, is still adequate.
Like erik_squires said, I also would install Cat 6 minimum.
FWIW the cable’s performance is only as good as the connectors used and terminations of the cable pairs to the jacks.
My preference is Panduit.
Here a Mini-Com jack. Color is blue. You can pick another color...
Mini-Com® UTP RJ45 Cat 6 TG Jack Module, Blue - Panduit
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You will need a EGJT-1 for the termination of the cable pairs to the jack. You can buy one for less than $5.00. Wholesale house that carry Panduit products will give you one free if you buy the jacks and wall plates from them.
TG Jack, Field Term Plug Termination Tool - Panduit
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Here is a Youtube video on how to install the Mini-Com Cat 6 RJ45 jack.
Terminate Panduit Minicom Ethernet Cat 5 / 6 Network Jacks
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Note, when the guy says Ethernet wiring color scheme is 568b. All Commercial is wired 568b. For some strange reason residential is 568a. Why 568a? Beats me. I wire all my jacks and plugs 568b. Either way works the same as long as both ends are wired the same. The jacks and plugs are stupid. They have no idea whether they are in an office building or in a residence. FWIW all pre-made patch cords are wired 568b.
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What’s available? Example:
https://www.graybar.com/search?text=Mini-Com%C2%AE%20Classic%20Faceplate
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