Maybe I'm being overly optimistic, but I think a lot of the discrimination is specifically anti-Boomer or anti-people-who-didn't-grow-up-with-Internet, not specific to age. If true, then 40 will be the 30 of 10 years ago.
A very small percentage of people born in 1930-1955 were involved in building the Internet. I suspect people like Vint Cerf don't get age-discriminated against -- we're mostly concerned with age discrimination against people in the ~35-70 age range who don't have specific major accomplishments.
(I was born in 79, but first got (limited) Internet access in 1986 or so, and much more Internet access in 1990. At the time, everyone was ~18-~40yo. There were some BBS people who were slightly younger, but even that only kicked off in the 80s.)
There really weren't a lot of people working on Internet technology until the first dotcom boom of the 1990s -- people who were generally young at the time. Even then, it was a small percentage of people compared to today. There were more people involved in UNIX, telcos, general technology, etc. who were early adopters of the Internet in the 90s, or who retained access from university in the 70s or even 80s and continued in parallel with their primary career, but in the mid/late 90s, "knows how to use the Internet" was still a useful selector in hiring, as it was rather rare.
There are all the other reasons why older people get discriminated against (perceived and real higher salary expectations, working requirements, location inflexibility), but those aren't as specific to technology. Hence, I think the actual level of discrimination in tech is going to fall to be the same as a lot of other fields.
BBSes were an awesome experience--modem AT commands, the excitement of getting an account on an exclusive system, chatting with the sysop, pondering the advantages of zmodem vs. BiModem... I'd consider growing up with BBSes and the languages of the day a much better primer than growing up with touchscreens and walled gardens.
