Ok, based on the replies up to now, I'm definitely a youngster
The first computer I used was an Intel 8086, with a 8087 Co-Processor (both at 8MHz), running DOS off 2 5 1/2" floppies.
The first computer I owned was an Intel Pentium at 90 Mhz (with F0 0F bug). Originally with 32 MB RAM, a 2x CD-Drive, and a 14.4 Kbit modem, running MS-DOS 6 and Windows 3.11, upgraded since to 64 MB RAM, a DVD drive, 100 MBit NIC, and running LFS. It still gets its occasional action if I want to test software against older libraries.