ca 1982: Astro Wars!!!!
ca 1984: BBC B+ Micro
ca 1986(?): Mario's Cement Factory!!!
ca 1990: Sega Master System II (long live 8-bit Sonic 2 and Speedball 2!)
ca 1992: Sega Mega Drive (Genesis for those in the States)
ca 1994: 486DX66
1999: Pentium2 350MHz
2004: Athlon3200+
By the way, I'm not too sure about the childhood to adulthood thing. I think I'm still well and truly stuck in the former
.