Not OP, but I can tell you how it was working out on my previous team within a big 4 tech co. For the context, the whole team consisted of a mix of a few people

Not OP, but I can tell you how it was working out on my previous team within a big 4 tech co. For the context, the whole team consisted of a mix of a few people in their 20s (1 being almost 30, 2 being straight out of college in their early 20s), 2 in their 30s, manager in their 40s, 1 more person in their 40s, and 1 person in their 50s. Almost like a paper perfect age diversity bingo card. What i found was that age had absolutely nothing to do with anything when it came to my workplace. There were more differences between some teammates in their 20s than between them and the teammates over 40. Older teammates were not slower or learning less things or anything like that. The only major workplace difference i have noticed between younger and older people was that they were better at estimating their schedules/delivery timelines, as well as them being able to spot certain things that younger ones havent spotted yet, i guess due to their experience with certain problems and being able to see those repeating patterns. A bit more patience and being a bit better at explaining things in bajillion different ways until one of them clicks for you; i would say social skills and ability to navigate the workplace in general were a bit higher. But that was definitely not universal for every older person, just simply talking about averages within the groups of older people i got a chance to work with. However, i bet it had a lot to do with the kind of people we hired, and if you look at the industry averages of older people vs younger people (when it comes to being up to date on the tech stack, research, learning new things, etc), the picture painted would be vastly different.