Ha! I changed my GS450H for an IS-F 18 months ago. They are chalk and cheese. Your 'old lady' will have no problem getting in and out of the car (my mum's 87 and does that just fine) but for her every bump in the road will be as a life-shortening earthquake. Run over a coin in the road and you know it. On the other hand for the slightly less aged the IS-F is pure joy to drive - every journey something to look forward to. I'm starting to think seriously about the 2011 model right now.