Where's this data from, out of curiosity? 5 teams who won with an average age profile of 24.1 and 5 losing sides with an average age of 26.1 seems kinda weird. Games played list seems accurate, but about 5 of those results were upsets.Age profile is far less relevant than many think. Out of the 9 games - 7 of the teams that won were younger in both Age and Average games.
Adelaide - 24.6 average age, 76.6 games v Brisbane - 26.10 average age, 132.6 games
Fremantle - 24.4 average age, 75.4 games Beat Melbourne - 26.1 years, 118.3 games
Port - 24.11 average age, 81.0 games Beat Richmond - 26.10 average age, 119.3 games
Gold Coast - 24.11 average age, 78.2 games beat Bulldogs - 26.1 average age, 102.7 games
Essendon - 24.11 average age, 79.5 games beat WC - 25.1 average age, 87.3 games
GWS - 24.11 average age, 74.9 games beat Geelong -26.11 average age, 120.3 games
Hawthorn - 24.1 average age, 67.2 games beat St.Kilda - 25.6 average age, 94.4 games
The significance of age/experience profile is just that it tracks pretty close to the ladder, with older teams generally towards the top. For example last year all the teams in the top half of the list age ranking won 10+ games except West Coast, while the 5 youngest lists all missed the eight. The younger outliers who did well (Collingwood, Fremantle, Brisbane) all looked like rising threats for the coming years and the older lists that did poorly (West Coast, GWS) looked in need of a refresh.
Lots of reasons for this obviously and it's not necessarily that age profile causes losses, it's also that teams that are losing often ditch their experienced players and try and rebuild. But if you just tipped the older team to win most of the time you'd do decently well.