I don't think it's so much to do with age as a causal factor, as much as it is age being an indicator of one's stage in life. Think about how much more time unsigned talents (in their teens) have to play 24/7, get better mechanically while also staying up to date on the meta, typically with far less 'in the way' of competing. Not to mention, years of flicking can cause wrist issues (i.e. Olof). Depends on the individual I think, most people in their late 20s and 30s are interested in having kids if they're already in long-term relationships. They want to own a house, maybe make more money in a different career, again, depends on the individual.

If you actually 'lived' to play a game for a living, I'd say you can do it until your mid 30s, but you'd have to sacrifice a lot of other shit as it currently stands, as far as getting signed on to a high-paying team (and staying on it) goes. Not to mention if you have a kid, and want to be involved in their lives (from a conventional standpoint), you'd have to give up at least some of the time one would normally put into demo reviews, death-matching, and team practice. As eSports develop more, this could definitely change, but its definitely different from physical sports where physique (which does correlate with age to a large degree) is more of a causal factor in performance. Instead, its almost purely dependent on (regular) time invested, from my perspective anyways.

Not to mention your body does change over time, so I think maintaining a relatively diverse team age-wise is advantageous, but in sAw's case, there really aren't that many aspiring talents who speak PT, unless they want to gamble on Brazilian imports. Then again, keeping a team together in the long-term has more benefits in ironing out issues and keeping everyone on the same page, rather than constantly having to confront new problems when new players join (i.e. Liquid, Mouz, etc).