My main machine is six years old and still hanging in there. Hope it survives more than another three!
It's only a Core i7 2.8GHz (1st/2nd gen), but it's been upgraded to 12GB of DDR3 which requires quite an effort to use up. (Unlike on my work machine which only has 8GB and is a constant chore to keep below 7GB used!)
I do also have a Skylake i3 system with 16GB that I've been (slowly) getting setup with Arch Linux, which I'll use for development work once it's ready.