bippacooleth
Quiver Dance=Success
When you met the Grunt again in BW, [He says that while he had planned to revive Team Rocket, soon after returning home he fell in love and then married.] This quote is from http://bulbapedia.bulbagarden.net/wiki/Icirrus_City#Ex-Team_Rocket_Grunt.27s_house
That attempt to revive TR probably came after you defeated him in Kanto in GSC. He returned home, met his wife, and had a kid. Probably took them at least a year to have a kid. Yeah, the kid can talk when he's 3, but he talked in full sentences. He's probably at least 4. My guess. So 3 years + 5 ish years = 8.
I stand corrected! It feels so wrong for Red and Blue to be an adults though :'(