T. K. Arispe

 Just how old is Professor Oak? His age is never stated in the games. In the fourth movie, which takes place during the Johto saga of the anime, he's 50, and his anime design is nearly identical to his game artwork, so what if we assume he's meant to be 50 in the games as well? Except Gen I takes place two years before Gen II, so Oak would have been 48 in Gen I. (That means he would have been 38 when Blue was born????) 

I think what the games are trying to tell us is that 48 is far too old to be doing anything meaningful with your life anymore, so just go live in a nursing home and save the adventures for the tweens.