Why do so many of these trainer games have you play as old men, old men in disguise, people disguised as old men, or suchlike?
Witch Trainer has the protagonist be disguised as Dumbledore, which sorta puts a dampener on all the sex-scenes.
Book 4 of Four Element Trainer has you disguised as Tenzin, who is basically the primary target's grandfather.
Even princess trainer has you playing as Genie in a hooded robe, and he's not exactly a looker.
Paparika trainer has you play as a fairly young man, but he's clearly insane and kind of a moron.
Orange Trainer just has 'miscellaneous man in robe' with no real distinguishing features.
And here your protagonist is Señor Senior, Senior, an old man playing at being a supervillain, magically turned young by a weird laser.
Except... His son, Señor Senior, Junior is right there, and he's a lot less of a nice old geezer and more of a vapid teenager who could conceivably come up with an evil scheme that has 'Plow your arch-nemesis' as it's end-goal.*
I dunno. It's just kinda awkward.
It's not super awful like it would be if his portrait was still of an old man but nobody else could see that, and it's not as bad as Ugly Bastard porn, but it's still a weird trend that keeps popping up with this genre.
Although Senior's complete befuddlement as to how the poor live is pretty funny sometimes.
Edit: *Now that I think about it, that could be a fun alternative plot.
The laser that hit Senior doesn't de-age him, it turned him green but left him otherwise unharmed.
After checking his Evil Guide on how to respond to 'accidentally being transformed by a hero that you were battling' it suggests having your successor or heir take revenge, so he kicks Junior off his backside and makes him go undercover to try to get at Kim somehow.
Then, away from his father's influence and supervision Junior starts to enjoy getting close to Kim Possible and his goals shift from 'Seek pretend vengeance to keep my dad happy' to 'Get into Kim's panties.' while occasionally receiving calls from his father on the hologram-thingy demanding updates on his 'devastating vengeance' against the girl who turned him green.
"Smash Kim Possible!"
"If you insist pops."