With a few inexpensive upgrades (ram and SSD), this early 2009 mac mini runs Mojave surprisingly well : r/mac
Memory Upgrades for 2009-2010 Mac mini Unibody Models
A Mid 2009 MacBook. Running macOS Catalina using dosdude1's Catalina patcher, 4GB of DDR2 RAM and and 120GB SSD. Got it for € 10,-. It's a gift for my son, so he
How to Upgrade RAM in a 2009 / 2010 MacBook Pro - Memory Replacement - MacBook Tutorial - YouTube
13-inch MacBook Pro Mid 2009 Memory Installation Video - YouTube
Fixxo - MacBook RAM Upgrade | Do more with your Old Mac
RAM Upgrades For Apple MacBook (2009 - 2010) from OWC
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book,
CMS 8GB (2X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® MacBook Pro Core 2 Duo 2.8 17" Mid-2009 - A35 at Amazon.com
How-To: Boost your Mac's speed and prolong its useful life with easy RAM upgrades - 9to5Mac
Timetec 8GB KIT(2x4GB) Compatible for Apple DDR3 1067MHz / 1066MHz PC3-8500 CL7 for Mac Book,