https://www.youtube.com/watch?v=N8qZt0zRwDs

This decimates all.
Plus The actor who plays Red Turbo, Kenta Sato, sings the song and does it well. Best part is He wears his character's civilian clothes for most of his performances.

https://www.youtube.com/watch?v=58MzL6KAgJ4

That is fan service at its finest right there.

I like Goseiger; it is catchy as hell

Gekiranger's!
Followed by Secret Kakuranger

I love the majority of them but Dairanger, Dekaranger and Gokaiger are among my favorites.

who is the oldest main team member on any sentai team?

We have a couple century old rangers. Perhaps Torin or Utchy?
I'm certain there are older members, but I haven't seen every series.

I believe Kyoryuger's Nobuharu is the oldest. He was 32 years old when he become a ranger.

There are all six of the Zyurangers and Riki/Kingranger but they hibernated so not sure if that counts.
If hibernation can be overruled then those seven I guess. :)

So...What are the chances of the film rangers being added into next year's Super Hero Taisen?

I know they're not Sentai, but still, Toei has made weird choices before.

GoGoV has the best opening.

https://www.youtube.com/watch?v=Sva-YWikHoo

I was looking for the show's opening but this video's pretty cool!