I am having trouble following exactly what you have done and what you are trying to do.
Figured a new SSD and 2 discs and now I'm at a loss.
Is the SSD Internal? or External?
What "two discs" are you referring to? Snow Leopard and XP?
Why? Has it failed? or failing?
Does it have an OS currently on it?
SSD? how is it formatted? Is it FW or USB?
Now Snow Leopard starts to load but it doesn't finish and most frustrating many of the choices on the menu bar are grayed out.
Can you take a photo of what is going on?
I've never had a computer last 14 years ever. Something always seems to burn out.
A lot of my Macs are older than 14 years and still working.
Actually, I still own almost every Mac in my signature almost all of them still work.
Some did have components that failed and I have fixed them, but many of them still have the original parts.
You have a point though, sometimes it might be easier for someone to get a Mac that is a little newer, especially if they are not "tech savvy" as the OP put it.
Also, the thermal paste tends to dry up over time and become less effective, causing the computer to get hot, fans run higher, and throttled speed. It would be a good idea to replace it, but could intimidate people that never done anything like that before.
I personally wouldn't use a 14 old Mac as my main Mac. Then again, my parents only computer is a Mac I gave them and it a Mid 2007 iMac.