macjack wrote:
I don't think it would be worth upgrading.
If this is your MacBook then the latest OS it will run is 10.7.5 which hasn't been supported for quite a while.
https://everymac.com/systems/apple/macbook/specs/macbook-core-2-duo-2.2-white-13 -late-2007-santa-rosa-specs.html
You could upgrade the RAM to 8GB and install an SSD but you don't know how long other components would hold out and you'd have spent money you could have put into a new Mac.
I've got that exact model myself, which was only available from Apple for about 4 months. I think it maxes out at 6 GB, although 4 GB works pretty well. An SSD would also be restricted to the 1.5 GB SATA I speeds.
The worst thing (for hardware parts) would be that Apple no longer has batteries for any of the pre-Unibody MacBook models. Any OEM battery is likely to be in bad shape unless someone managed to periodically charge it to keep it from getting to a deep discharge state.
I keep mine around and it still works perfectly even though the case is pretty beat up. But I keep it around for sentimental reasons. I wouldn't put anything into it unless it was purely as a hobby. It might be worth keeping around to do stuff that might require an optical drive, like ripping songs from CD with iTunes or watching DVDs.