#since he's 47 years old and pnf takes place ~2012

[forgottenpnffacts]

Do they ever mention the year Kevin destructicon was born? Because it’s mentioned on the wiki and I personally don’t remember it being mentioned at all (but that may just be me)

Kevin Destructicon only appeared in "One Good Scare Ought to Do It!" and "Rollercoaster: The Musical!" and his birth year wasn't mentioned (or referred to in visual form) in either of those episodes! The wikia doesn't list a source, and I can't find anything on Dwampy's twitters (or by specifying key terms in Google in case it was in an interview or something)--I have no idea where that date is from.

[forgottenpnffacts]

Is Doof really 47 years old? That doesn't sound right to me and if he was, then that'd mean Linda is well, since they both dated as teens, and that feels even weirder to believe.

Yes, Doof is really 47 years old (like I said in my debunking of the “Doof is Candace and Phineas’ father” theory, Roger can be trusted as a source for this since he’d know his own birthday and how old Doof was in relation to him as a child). 

Since Doof came to America when he was around 16,

he would be either around 17 or 22 during his and Linda’s singular date–”dated” implies more than one date, which they did not have–in 1982 depending on if you consider the PnF timeline to take place in 2007 or 2012 (again, check my debunking answer for more information about that–CTRL + F to “2007” for the timeline section in the answer).

Also, Vanessa being 16 would place him at having her when he was around 31, which sounds right to me.

(The same goes for Candace being 15/Linda having her around a similar age.)