The closing talk at FOSDEM 2019[1] was so enthralling that when maddog (the greybeard speaker) ran out of time (around the 45:30 mark), the audience cheered for it to keep going and the organisers went with it.
At FOSDEM 2020, the final talk[2] was outright called “maddog continues to pontificate”.
Ageism may be real in the industry, but there is definitely a sizeable number of programmers who recognise the value of experience and enjoy the “war stories”.
[1]: https://archive.fosdem.org/2019/schedule/event/keynote_fifty...