Even after 12 years, my late 2008 MacBook Pro hasn't given up. Upgraded it to 8GB of ram, added an SSD, and patched it with MacOS Catalina. Still use it everyday. :
How to Upgrade the SSD in a MacBook Air (2008) - YouTube
Amazon.com: 240GB 2.5" SSD Solid State Drive for Apple MacBook (13-inch, Aluminum, Late 2008) (13-inch, Early 2009) (13-inch, Mid 2009) (13-inch, Late 2009) (13-inch, Mid 2010) : Electronics
How to replace HDD/SSD in MacBook Late 2008 Aluminum | Mac Cheat Sheet
Installing MacBook Pro 15" Unibody Late 2008 and Early 2009 Dual Hard Drive - iFixit Repair Guide
How to Upgrade MacBook Pro Hard Disk, Late 2008, 15-Inch: EveryMac.com
Apple MacBook Pro 15" Late 2008 2.4GHz A1286 MB470B/A 2.5 Hard Drive/SSD Drive | eBay
Amazon.com: SZYIKUER 2nd 2.5''HDD SSD Hard Drive Caddy Tray Replacement for MacBook Pro 13/15/17 inch A1278 A1286 A1297 2008 2009 2010 2011 2012 Internal Laptop CD/DVD-ROM Optical SuperDrive Adapter : Electronics
Photo tutorial: Upgrading a MacBook Pro with an SSD
Upgrading my Early-2008, 24-inch iMac with an SSD - Analog Senses
MacBook Pro 15" Unibody Late 2008 and Early 2009 Hard Drive Replacement - iFixit Repair Guide
15-inch MacBook Pro Late 2008 Hard Drive/SSD Installation Video - YouTube
My Late 2008 MacBook running El Capitan 10.11.6 (could use a RAM upgrade to 8GB and the HDD upgrade to an SSD to make it swifter than it is currently). : r/macbook
OWC SSD Upgrade Kits For Mac Pro 2008
How to replace HDD/SSD in MacBook Late 2008 Aluminum | Mac Cheat Sheet
How to Upgrade MacBook Air Hard Drive (Original/2008/2009): EveryMac.com
Apple MacBook Pro 13" Late-2008 4GB Ram 128GB Samsung SSD Great To Upgrade READ | eBay
How to replace HDD/SSD in MacBook Late 2008 Aluminum | Mac Cheat Sheet