As a recent LaX buyer, I'll go on record as saying this is the most underestimated cars on the market. My budget (I have a kid in college - you can relate) was low 20s and at that price point the LaX excells (IMHO). I wanted space, relaibilty, decent mileage and comfort. My LaX CX meets all of those better than any other car. The quality is second to Lexus and the 3800 engine has been around forever. It is quite, well put together and materials are fine for the 20k price. My daughter has an Altima and while it is a fine car my Lax is much more refined. Accord and Camry are fine cars but with a GM discount and rebates the Lax price can't be beat.
I think Buick has two problems. First, they have done little to promote the bentefits and features of the LaX. Second there is too much price overlap between the Lucerne and the LaCrosse. I struggled with this quite a bit but until college is paid for, I'm on a budget. Buick either needs to raise the price on the Lucerne or value price the LaCrosse even more. If I remember, the price difference is about 3k. And a loaded LaX gets into Lucerne territory fast.
I don't think Buick can survive on just one sedan and a future crossover.
As far as an old persons car - I'm 56 so whatever! If possilbe, I'd be driving a Corvette in a New Tor4k minute so I guess the 'Vette is an old man's car too.
Cheers