Insurance costs typically decrease on a sliding scale, so in theory you could ask the question of "does everybody wish to buy a 911 at the age of 50 becaues you can then afford to insure it". The right answer is have a scan at the costs of insurance and THEN make a decision, regardless of age.
Ref the IS200, well I like them. Their interiors are "interesting" and IMO of high quality, if a little bling. Sure, they're not fast or economical, but fast is rapidly becoming pointless on our gridlocked roads and if your mileage is low, then who cares about economy. More importantly, they're a nice place to be, very reliable and dirt cheap s/h for what you get. They were top of the pile of cars that I was considering as a second car for the missus.