Even in tech I think it's easy to overstate the level of dynamism. A lot of the buzz is around startups, but a huge amount of the industry is owned by fairly ol

Even in tech I think it's easy to overstate the level of dynamism. A lot of the buzz is around startups, but a huge amount of the industry is owned by fairly old companies. Digging through the Forbes 500 list, there are 10 companies of the top 100 that I would consider "tech". They are (with year of founding): #5 Apple (1976), #17 HP (1939), #23 IBM (1911), #34 Microsoft (1975), #35 Amazon (1994), #46 Google (1998), #53 Intel (1968), #55 Cisco (1984), #69 Ingram Micro (1979), #82 Oracle (1977). By decade that's: 2 from the '90s, 1 from the '80s, 4 from the '70s, 1 from the '60s, 2 pre-WW2. Looks like the '70s were a good time to do a tech startup. :)