Transmission flush question

[Yariszoom]

Hi all,

2008 Yaris hatch (3door) with a manual transmission. I now have 152,000 miles on the car and I've never changed the transmission fluid. It's been one hell of a car for me and I've never had the money to do all the maintenance I wish I could have. I'm hoping to keep her alive for another 100k and was wondering if I should change the fluid with this many miles. What would you do?

I've changed over to synthetic oil and changed the plugs. I've got decent tires and I've just done a brake job.

Also, my dad borrowed the car from me for a couple months. He's kind of a drunk idiot and usually can't be taken seriously he said "heck of a little car. I advanced the timing to make her run a little hotter hehhe (spits dip and drinks beer)". ..

I'm wondering, isn't this impossible with a vvt-i? I thought the point was to do it electronically. Was he just talking out of his ass or should I check for something?

Thanks for the help and for letting me post my question!