I don't think ageing fanbase is a problem exclusive to Pokemon.
In fact, I'm thinking Pokemon is one of the better performing series in terms of attracting younger audience still.
Gaming industry itself is facing the same problem. Bigger part of audience is now in 20s and 30s vs teenagers 20 years ago.
Depending on the severity, it might not even be a problem because in a lot of countries, the demographic has been shifting older on average, so businesses have to sell to older audience.
In fact, I'm thinking Pokemon is one of the better performing series in terms of attracting younger audience still.
Gaming industry itself is facing the same problem. Bigger part of audience is now in 20s and 30s vs teenagers 20 years ago.
Depending on the severity, it might not even be a problem because in a lot of countries, the demographic has been shifting older on average, so businesses have to sell to older audience.