Welcome back. I know what you mean , I just turned 60 myself and it's the new 30 in my head.
Your going to get a lot of opinions, so here's mine; Griots G9. I have the older. GG2 version and it is a step above your Porter Cable as far as power. If your staying at one for under $200, there are a few more brands such as Maxshine, Adams, Harbor Freight, and more. But for the quality and warranty, it's hard to beat the Griots.
As far as pads to match one of these; you can stay with Griots. Lake Country's SDO, Thin Pro, or Flats. Buff n Shine Uro-Cell or Flats.
I hope this helps. I have the GG2, Maxshine 15mm Long Throw, Adams 12mm 3", Griots 3", and the Diavolo Mini (Rupes Hybrid) knock off. And I had to break down and get the Flex SupaBeast. I'm just a weekend warrior but love my toys. Yes I have an addiction. I've used them all except the SupaBeast and the Diavolo Mini and have no big issues overall. Due to a pinched nerve is why I have yet to use the Flex or Diavolo so I can't comment on them yet. But have read enough to know it was money well spend as far as cutting down buffing time.
There is no perfect machine out there. Just maybe near perfect. This is due to your physical makeup, ability, stamina, budget, quality of machine, and etc. But if your just doing your cars and maybe family and friends, you can't go wrong with the Griots G9. I can't say this from experience, but reading reviews and on forums anyone that has stepped up from the GG, GG2, or GG3, just rave about them.
